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<span class="elsevierStyleItalic">alpha&#44; beta&#44; delta</span> and <span class="elsevierStyleItalic">gamma&#46;</span> To date&#44; the <span class="elsevierStyleItalic">alpha</span> and <span class="elsevierStyleItalic">beta</span> types have been determined to infect humans&#44;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">5</span></a> causing diseases ranging from the common cold to more severe conditions&#44; such as Middle East respiratory syndrome &#40;MERS-CoV&#41; and severe acute respiratory syndrome &#40;SARS-CoV&#41;&#44; which caused thousands of deaths in 2002&#46;<a class="elsevierStyleCrossRefs" href="#bib0215"><span class="elsevierStyleSup">6&#44;7</span></a> Four of the human coronaviruses &#40;HCoV 229E&#44; NL63&#44; OC43 and HKU1&#41; are endemic worldwide and represent 10&#8211;30&#37; of upper respiratory tract infections in adults&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">5</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">Structurally&#44; coronaviruses are spherical or pleomorphic&#44; with diameters of 80&#8211;120<span class="elsevierStyleHsp" style=""></span>nm&#46; Various electronic microscope analyses have identified the surface of the virion&#44; discovering that they are structures organized by projections that in turn consist of viral spike &#40;S&#41; glycoprotein trimers&#46;<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">8</span></a> Additionally&#44; other short projections composed of hemagglutinin-esterase &#40;HE&#41; protein dimers have been identified&#44; which have been observed in some <span class="elsevierStyleItalic">beta-coronaviruses</span>&#46;<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">9</span></a> For its part&#44; the viral envelope is reinforced by the membrane &#40;M&#41; glycoprotein &#40;the most abundant on the virion&#39;s surface&#41;&#44; which is found embedded in the membrane by 3 transmembrane domains&#46;<a class="elsevierStyleCrossRef" href="#bib0235"><span class="elsevierStyleSup">10</span></a> Another structural component of the virion is the envelope &#40;E&#41; protein&#44; a small protein that is highly hydrophobic and is found to a small proportion than the other proteins&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">11</span></a> The viral proteins of the coronavirus are embedded in a lipid membrane that is created by the infected cells&#46; Internally&#44; the virus particle consists of an additional protein known as the nucleoprotein &#40;N&#41;&#44; which binds to the virus RNA in a helical structure similar to a beaded string&#44; thereby protecting the RNA from degradation &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>A&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">8</span></a></p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0035" class="elsevierStylePara elsevierViewall">The genome of coronaviruses is positive-polarity&#44; single-strand nonsegmented RNA &#40;&#43;ssRNA&#41;&#44; which measures 27 to 32<span class="elsevierStyleHsp" style=""></span>kilobases&#46; The genomic RNA presents certain changes such as polyadenylations in the 3&#8217; terminal region&#59; in contrast&#44; the 5&#8217; terminal region contains a cap structure&#46;<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">12</span></a> Within this RNA&#44; there are numerous open reading frames &#40;6&#8211;11 ORFs&#41;&#46; The first ORF encodes approximately 16 nonstructural proteins&#44; while the remaining ORFs encode accessory and nonstructural proteins &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>B&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">13</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">The genome sequence analyses for 2019-nCoV were fairly similar to those of SARS-CoV&#59; however&#44; there are certain differences such as the lack of the region encoding for protein 8<span class="elsevierStyleHsp" style=""></span>a in 2019-nCoV&#44; which could therefore have resulted in its lower pathogenesis when compared with SARS-CoV&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">14</span></a></p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Origin</span><p id="par0045" class="elsevierStylePara elsevierViewall">One unknown that is still being investigated is the virus&#8217; zoonotic origin&#46; Due to the close similarity between 2019-nCoV and bat coronaviruses&#44; it is likely that bats are the main reservoir for the virus&#46; Various studies were conducted when this new class of coronavirus appeared and discovered that 2019-nCoV is 96&#37; identical to a bat coronavirus at the genome level&#46; The same study revealed that this virus belongs to the SARS-CoV species&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">15</span></a> Thus&#44; it was speculated that SARS-CoV was transmitted to humans from exotic animals in markets in the outbreak 18 years ago&#44;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">15</span></a> while MERS-CoV was transmitted from camels to humans&#46;<a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">16</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">The reports documented that many of the first identified patients share the common factor of contact with a seafood and animal market&#59; however&#44; other patients had no contact with these locations at any time&#44; which shows the limited person-to-person infection after identifying groups of cases among families&#44; as well as transmission from patients to health workers&#46;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">17</span></a> Moreover&#44; a recently published study estimated that 95&#37; of the cases of 2019-nCoV infections in Wuhan showed symptoms before the 12th of January 2020&#44;<a class="elsevierStyleCrossRefs" href="#bib0275"><span class="elsevierStyleSup">18&#44;19</span></a> a fact that&#44; combined with the virus&#8217; incubation period&#44; suggests a high possibility of the disease&#39;s travel-related propagation&#46;<a class="elsevierStyleCrossRefs" href="#bib0285"><span class="elsevierStyleSup">20&#44;21</span></a></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Transmission</span><p id="par0055" class="elsevierStylePara elsevierViewall">Generally&#44; coronaviruses replicate primarily in the epithelial cells of the lower respiratory tract and&#44; to a lesser extent&#44; in the cells of the upper respiratory tract&#46; Transmission therefore mainly occurs from patients with recognized disease and not from patients with mild and nonspecific signs&#59; in other words&#44; it is believed that propagation occurs only after the patient shows signs of the disease in the lower respiratory tract&#46;<a class="elsevierStyleCrossRefs" href="#bib0295"><span class="elsevierStyleSup">22&#44;23</span></a> However&#44; patients with 2019-nCoV infection detected in a severe or fatal state have a greater probability of transmitting this virus&#44; given that they expel a greater quantity of infectious particles than patients who have the mild or asymptomatic form of the infection&#46; Identifying and quarantining these patients in health centers where outbreaks have occurred&#44; along with the implementation of appropriate infection control and constant reports on cases from various countries&#44; have been effective in reducing the transmission and containing outbreaks of the disease&#46;<a class="elsevierStyleCrossRef" href="#bib0305"><span class="elsevierStyleSup">24</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">The mean number of new cases that a case of coronavirus generates over the course of its infectious period &#40;R<span class="elsevierStyleInf">0</span>&#41; varies between 2&#46;24 &#40;95&#37; CI 1&#46;96&#8211;2&#46;55&#41; and 3&#46;58 &#40;95&#37; CI 2&#46;89&#8211;4&#46;39&#41;&#44;<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">21</span></a> i&#46;e&#46;&#44; one individual can infect approximately 2 to 4 people&#44; which means that the infection can propagate rapidly and widely among the population &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0065" class="elsevierStylePara elsevierViewall">Who are most susceptible to the infection&#63; The novel coronavirus can infect people of all ages&#44; although the elderly and those with pre-existing medical conditions &#40;such as asthma&#44; diabetes and heart disease&#41; seem to be most vulnerable to falling seriously ill with the virus&#46; Thus&#44; the reported mortality rate for individuals older than 70 years is &#62;8&#37;&#46; According to reports&#44; the patients who died of this infection had a mean age of 56 years&#44; and most had other diseases &#40;heart disease&#44; stroke&#44; diabetes&#44; etc&#46;&#41;&#44; which could have made them more vulnerable to the virus&#46; The Chinese Center for Disease Control and Prevention reported that 1 to 2 men were infected for every woman&#46; It has been speculated that women&#39;s low susceptibility to the viral infections could be due to protection from their &#8220;extra&#8221; X chromosome&#46;<a class="elsevierStyleCrossRef" href="#bib0310"><span class="elsevierStyleSup">25</span></a> Children constitute a peculiar population with an immune system different from that of adults&#46; Virus transmission through their mothers with suspected or confirmed infection therefore occurs easily&#46;<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">26</span></a> However&#44; a lower severity and extremely low mortality has been observed&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Clinical presentation</span><p id="par0070" class="elsevierStylePara elsevierViewall">The diagnosis of the disease has been reached based on virus-induced pneumonia based on the clinical symptoms observed in the patients &#40;similar to that of other respiratory viruses&#41;&#44; to their history of exposure to other people with the virus&#44; and the history of visits to areas affected&#46;<a class="elsevierStyleCrossRefs" href="#bib0220"><span class="elsevierStyleSup">7&#44;27</span></a> Moreover&#44; a detailed study of the first 99 patients treated in the Wuhan Jinyintan Hospital&#44; conducted between the 1st and 20th of January 2020&#44; showed that of the 99 patients with 2019-nCoV pneumonia&#44; 49&#37; had a history of exposure to the Huanan seafood market and that 51&#37; had chronic diseases&#46; These patients&#8217; mean age was 55&#46;5 years&#44; 67 were men and 32 were women&#44; and the incubation period for the virus was estimated at 7&#8211;14 days&#46;<a class="elsevierStyleCrossRef" href="#bib0320"><span class="elsevierStyleSup">27</span></a> The analyzed patients had clinical manifestations of fever &#40;83&#37;&#41;&#44; cough &#40;82&#37;&#41;&#44; difficulty breathing &#40;31&#37;&#41;&#44; muscle pain &#40;11&#37;&#41;&#44; confusion &#40;9&#41;&#44; headache &#40;8&#37;&#41;&#44; sore throat &#40;5&#37;&#41;&#44; runny nose &#40;4&#37;&#41;&#44; chest pain &#40;2&#37;&#41;&#44; diarrhea &#40;2&#37;&#41;&#44; nausea and vomiting &#40;1&#37;&#41;&#46; According to imaging tests&#44; 75&#37; of these patients showed bilateral pneumonia&#44; 14&#37; showed significant mottling and ground-glass opacity&#44; and 1&#37; had pneumothorax&#46; Similarly&#44; 17&#37; developed acute respiratory distress syndrome&#44; of whom 11&#37; worsened in a short period and died due to multiple organ failure&#46;<a class="elsevierStyleCrossRefs" href="#bib0300"><span class="elsevierStyleSup">23&#44;28</span></a> Moreover&#44; the leukocyte counts were below the normal range in 9 of the patients and above the normal range in 24&#59; 38&#37; of them had above normal neutrophil counts&#46; The lymphocyte and hemoglobin counts were below the normal range for many of the patients&#44; and the platelet counts were below the normal range in 12&#37; of the patients and above normal in 4&#37;&#46; Forty-three of these patients had varying degrees of impaired hepatic function&#44; with alanine aminotransferase &#40;ALT&#41; or aspartate aminotransferase &#40;AST&#41; levels above the normal range&#46; One patient experienced severe hepatic function impairment&#46;<a class="elsevierStyleCrossRefs" href="#bib0325"><span class="elsevierStyleSup">28&#44;29</span></a></p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Classification of patients according to their clinical symptoms</span><p id="par0075" class="elsevierStylePara elsevierViewall">Considering the patients&#8217; clinical symptoms&#44; when should a 2019-nCoV case be labeled as suspected&#44; probable or confirmed&#63; According to the WHO&#44; a suspected case involves a patient with severe acute respiratory infection &#40;fever&#44; cough&#44; requiring hospitalization&#41; and with no other etiology that completely explains the clinical presentation&#44; as well as a history of travel or residence in China during the 14 days before symptom onset&#46; Alternatively&#44; a suspected case can involve a patient with an acute respiratory disease and at least one of the following factors during the 14 days prior to the onset of the symptoms&#58; &#40;a&#41; contact with a confirmed or probable case of 2019-nCoV infection or &#40;b&#41; working or attending a medical care center that was treating patients with confirmed or probable 2019-nCoV infection and patients with acute respiratory disease&#46; A probable case involves a patient whose 2019-nCoV tests are not conclusive or are positive using an assay for coronavirus but no laboratory evidence of other respiratory pathogens&#46; Finally&#44; confirmed cases involve patients with positive laboratory results for 2019-nCoV infection&#44; regardless of the signs and clinical symptoms&#46;<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">30</span></a></p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Clinical tests for the diagnosis</span><p id="par0080" class="elsevierStylePara elsevierViewall">Among the main priorities for facilitating public health interventions in patients is the laboratory diagnosis&#46; In the case of an acute respiratory infection&#44; the reverse transcription-polymerase chain reaction is commonly employed to identify the viruses that cause the respiratory secretions&#46;<a class="elsevierStyleCrossRefs" href="#bib0335"><span class="elsevierStyleSup">30&#44;31</span></a></p><p id="par0085" class="elsevierStylePara elsevierViewall">The test for detecting the viral envelope&#39;s gene sequence has been effectively implemented by 35 laboratories&#59; however&#44; the diagnostic algorithm employs other sequences of the viral genome to confirm positivity for 2019-nCoV by detecting gene sequences of the viral RNA polymerase and nucleoprotein&#46;<a class="elsevierStyleCrossRef" href="#bib0345"><span class="elsevierStyleSup">32</span></a></p><p id="par0090" class="elsevierStylePara elsevierViewall">Other samples to collect include&#8230;<ul class="elsevierStyleList" id="lis0005"><li class="elsevierStyleListItem" id="lsti0005"><span class="elsevierStyleLabel">&#40;a&#41;</span><p id="par0095" class="elsevierStylePara elsevierViewall">RNA extraction from clinical samples using the MagNA Pure 96 system&#46;</p></li><li class="elsevierStyleListItem" id="lsti0010"><span class="elsevierStyleLabel">&#40;b&#41;</span><p id="par0100" class="elsevierStylePara elsevierViewall">Respiratory material &#40;nasopharyngeal and oropharyngeal swabs for outpatients and sputum &#91;if presented&#93; and&#47;or endotracheal aspirate or bronchoalveolar lavage for patients with severe respiratory disease&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">33</span></a></p></li><li class="elsevierStyleListItem" id="lsti0015"><span class="elsevierStyleLabel">&#40;c&#41;</span><p id="par0105" class="elsevierStylePara elsevierViewall">Serum for serological tests&#44; acute samples and convalescent samples &#40;in addition to the respiratory material&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">33</span></a></p></li></ul></p><p id="par0110" class="elsevierStylePara elsevierViewall">The objectives of the diagnostic tests are to detect the common causes of early pneumonia&#44; to support disease control activities and to work with reference laboratories that can perform pancoronavirus detection and direct sequencing&#46;<a class="elsevierStyleCrossRef" href="#bib0340"><span class="elsevierStyleSup">31</span></a></p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Prevention measures</span><p id="par0115" class="elsevierStylePara elsevierViewall">The standard recommendations issued by the WHO for preventing the propagation of the infection include washing hands on a regular basis&#44; especially after contact with sick individuals or their environment&#44; covering the mouth and nose when coughing and sneezing&#44; cooking meat and eggs thoroughly&#44; avoiding close contact with any individual who presents symptoms of respiratory diseases &#40;coughing and sneezing&#41;&#44; avoiding traveling to affected cities and areas and avoiding close contact with live or dead farm animals or wild animals&#46; Travelers with symptoms of acute respiratory infection should practice coughing etiquette &#40;maintaining distance&#44; covering the mouth when coughing and sneezing into clothing or disposable tissues and thoroughly washing hands&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0220"><span class="elsevierStyleSup">7&#44;34&#44;35</span></a></p><p id="par0120" class="elsevierStylePara elsevierViewall">Those individuals who have had contact with patients categorized as having probable and&#47;or confirmed 2019-nCoV infection should be monitored for 14 days from the last unprotected contact they had with infected individuals and should limit their travel to locations beyond their residence to avoid possible propagation&#46;</p><p id="par0125" class="elsevierStylePara elsevierViewall">One of the most widely used preventive measures is face masks&#44; but can they stop the propagation&#63; Surgical face masks for the public are not 100&#37; effective protection against airborne viruses or bacteria&#44; because the masks do not have an adequate air filter and leave the eyes exposed&#46; Although face masks can help reduce the risk of contracting the virus through sneezing or coughing from others&#44; the optimal solution is respirators with specialized air filters&#44; because they are designed specifically to protect individuals against potentially dangerous airborne particles&#46; These are known as filtering face piece &#40;FFP&#41; face masks&#44; of the which there are 3 types&#58;<ul class="elsevierStyleList" id="lis0010"><li class="elsevierStyleListItem" id="lsti0020"><span class="elsevierStyleLabel">&#8226;</span><p id="par0130" class="elsevierStylePara elsevierViewall">FFP1 &#8211; filters approximately 78&#37; of air particles&#44; thereby protecting against nontoxic and nonfibrogenic residues of dust and aerosols and preventing the inhalation of bothersome residues and smells&#46;</p></li><li class="elsevierStyleListItem" id="lsti0025"><span class="elsevierStyleLabel">&#8226;</span><p id="par0135" class="elsevierStylePara elsevierViewall">FFP2 &#8211; filters approximately 92&#37; of air particles&#44; protecting against nontoxic residues and fibrogenic elements&#44; preventing the inhalation of toxic fluids of dust&#44; aerosols and fumes&#46;</p></li><li class="elsevierStyleListItem" id="lsti0030"><span class="elsevierStyleLabel">&#8226;</span><p id="par0140" class="elsevierStylePara elsevierViewall">FFP3 &#8211; filters 98&#37; of air particles&#44; protecting against poisons and toxins of dust&#44; smoke and aerosols&#44; as well as bacteria&#44; viruses and fungal spores&#46;</p></li></ul></p><p id="par0145" class="elsevierStylePara elsevierViewall">For isolation procedures and where infectious aerosols &#40;e&#46;g&#46;&#44; tuberculosis&#44; measles&#44; chickenpox&#44; SARS&#41; might be generated&#44; the WHO recommends using a ventilator with a filtration efficiency of at least 95&#37; for 0&#46;3<span class="elsevierStyleHsp" style=""></span>&#956;m diameter particles&#44; which is equivalent to an N95 facemask&#44; according to the US National Institute for Occupational Safety and Health &#40;NIOSH&#41; regulations&#46; Given that the US regulations differ from the European&#44; this level of protection for the general population is between FFP2 and FFP3&#46;</p><p id="par0155" class="elsevierStylePara elsevierViewall">In general&#44; the use of masks is recommended only if there is exposure to patients with respiratory diseases&#44; such as in hospitals and medical offices&#46; The guidelines for mask use should be strictly followed when exposing individuals to infected patients&#44; because poor handling and touching the eyes with the hands and with the edge of the mask increase the risks&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Who should be notified if there are confirmed cases or an infection is suspected&#63;</span><p id="par0160" class="elsevierStylePara elsevierViewall">Any individual who has been in contact with patients and who meets the clinical characteristics of the disease becomes a suspected case and should be confirmed through laboratory tests&#46;<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">30</span></a> The WHO requests that national authorities report confirmed cases of novel coronavirus infection within 24<span class="elsevierStyleHsp" style=""></span>h of identifying them and provide the patients&#8217; minimum basic data set&#46;<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">30</span></a> For Mexico&#44; cases of patients with signs and symptoms of the disease can be reported to the Epidemiological and Health Intelligence Unit &#40;<span class="elsevierStyleItalic">Unidad de Inteligencia Epidemiol&#243;gica y Sanitaria</span>&#44; UIES&#41;&#44; 24<span class="elsevierStyleHsp" style=""></span>h a day&#44; 7 days a week&#44; at &#40;&#43;52&#41; 800<span class="elsevierStyleHsp" style=""></span>0044<span class="elsevierStyleHsp" style=""></span>800&#46; In Spain&#44; cases should be reported in Madrid to the Ministry of Health &#40;<span class="elsevierStyleItalic">Ministerio de Sanidad</span>&#41; at &#40;&#43;34&#41; 91<span class="elsevierStyleHsp" style=""></span>596<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleHsp" style=""></span>00 or to the National Institute of Healthcare Management &#40;<span class="elsevierStyleItalic">Instituto Nacional de Gesti&#243;n Sanitaria</span>&#41;&#44; at &#40;&#43;34&#41; 91<span class="elsevierStyleHsp" style=""></span>338<span class="elsevierStyleHsp" style=""></span>00<span class="elsevierStyleHsp" style=""></span>00&#46;</p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Treatment</span><p id="par0165" class="elsevierStylePara elsevierViewall">Meanwhile&#44; numerous research laboratories are currently seeking a treatment that can eliminate the MERS-CoV infection&#44; either with the drugs that are already part of the pharmaceutical industry and are being employed for other diseases or by searching for new more specific alternatives for the virus&#44; given that there is currently no specific vaccine or treatment&#44; although there are several specific vaccines and treatments in the development phase&#46;</p><p id="par0170" class="elsevierStylePara elsevierViewall">Despite the short time&#44; it has been predicted that a vaccine will be ready for animal testing in approximately a month and that in 3 months it could be ready for humans&#46; For now&#44; the treatment is only supportive and depends on the patient&#39;s clinical condition&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">36</span></a></p><p id="par0175" class="elsevierStylePara elsevierViewall">Broad-spectrum antivirals&#44; such as remdesivir&#44; lopinavir&#47;ritonavir and interferon beta&#44; have shown promise against MERS-CoV in animal models&#44; and their activity against the present 2019-nCoV is being evaluated&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">36</span></a> Scientists at the Vaccine Research Center of the National Institute of Allergy and Infectious Diseases of Washington DC have employed approaches that use nucleic acid-based vaccine platforms to counter the infection&#46;<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">37</span></a></p></span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Conclusion</span><p id="par0180" class="elsevierStylePara elsevierViewall">The WHO is collaborating with specialists in public health and animal health&#44; clinicians and scientists from around the world to meet and exchange scientific data to better understand the virus and the disease it causes&#46; An example of these data is the identification of new secretion pathways in infected patients&#46; Similarly&#44; the WHO has focused on determining the priorities in the response to outbreaks&#44; the therapeutic strategies for treatment and the approaches for clinical care&#46; There are analyses that suggest that certain SARS-CoV-specific monoclonal antibodies can be effective in neutralizing 2019-nCoV&#46;</p><p id="par0185" class="elsevierStylePara elsevierViewall">Undoubtedly&#44; it is everyone&#39;s task to help contain the outbreaks that have emerged in so short of a time&#46; It is therefore advisable that the general population follow all recommendations for preventing the infection&#46; Although the number of cases of infection outside of China are relatively low compared to the numbers within the country&#44; every country should be prepared for any situation related to this virus&#46;</p></span></span>"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">A new coronavirus outbreak emerged on the 31st of December 2019 in Wuhan&#44; China&#44; causing commotion among the medical community and the rest of the world&#46; This new species of coronavirus has been termed 2019-nCoV and has caused a considerable number of cases of infection and deaths in China and&#44; to a growing degree&#44; beyond China&#44; becoming a worldwide public health emergency&#46; 2019-nCoV has high homology to other pathogenic coronaviruses&#44; such as those originating from bat-related zoonosis &#40;SARS-CoV&#41;&#44; which caused approximately 646 deaths in China at the start of the decade&#46; The mortality rate for 2019-nCoV is not as high &#40;approximately 2&#8211;3&#37;&#41;&#44; but its rapid propagation has resulted in the activation of protocols to stop its spread&#46; This pathogen has the potential to become a pandemic&#46; It is therefore vital to follow the personal care recommendations issued by the World Health Organization&#46;</p></span>"
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        "titulo" => "Resumen"
        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Un nuevo brote de coronavirus surgi&#243; el pasado 31 de diciembre de 2019 en Wuhan&#44; China&#44; causando conmoci&#243;n entre la comunidad m&#233;dica y el resto del mundo&#46; Esta nueva especie de coronavirus fue denominada como 2019-nCoV&#44; causante de un gran n&#250;mero de casos y fallecimientos en China y en cantidad creciente fuera de ella&#44; convirti&#233;ndose en una emergencia de salud p&#250;blica a nivel mundial&#46; 2019-nCoV es un virus con alta homolog&#237;a con otros coronavirus patog&#233;nicos&#44; como los originados por zoonosis con murci&#233;lagos &#40;SARS-CoV&#41; causantes de aproximadamente 646 muertes en China a principios de la d&#233;cada&#46; Su tasa de mortalidad no es tan elevada &#40;aproximadamente del 2&#8211;3&#37;&#41;&#44; pero su r&#225;pida propagaci&#243;n ha propiciado la activaci&#243;n de protocolos para detener su diseminaci&#243;n&#46; Este pat&#243;geno tiene el potencial para convertirse en pandemia&#44; por lo que es vital seguir las recomendaciones de cuidado personal dictadas por la Organizaci&#243;n Mundial de la Salud&#46;</p></span>"
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      0 => array:2 [
        "etiqueta" => "&#9734;"
        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Palacios Cruz M&#44; Santos E&#44; Vel&#225;zquez Cervantes MA&#44; Le&#243;n Ju&#225;rez M&#46; COVID-19&#44; una emergencia de salud p&#250;blica mundial&#46; Rev Clin Esp&#46; 2021&#59;221&#58;55&#8211;61&#46;</p>"
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          "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">&#40;A&#41; Coronavirus particle&#46; This type of virus contains positive-polarity single-strand RNA &#91;&#40;&#43;&#41;ssRNA&#93; genetic material&#44; measuring 27&#8211;32<span class="elsevierStyleHsp" style=""></span>kilobases&#46; The virus consists of a nucleocapsid&#44; which in turn is composed of &#40;&#43;&#41;ssRNA and the nucleoprotein&#46; This structure is covered by a lipid bilayer&#46; Other structural proteins of the coronavirus are found here&#44; such as the spike protein&#44; which covers this virus particle&#44; as well as hemagglutinin-esterase &#40;HE&#41; dimers&#44; the highly hydrophobic envelope &#40;E&#41; protein and the membrane &#40;M&#41; protein&#44; the most abundant protein on the virion&#39;s surface&#46; &#40;B&#41; Organization of the genes in the 2019-nCoV genome&#46; The structural genes are shown in pink&#44; and the nonstructural genes are shown in blue&#46;</p>"
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          "en" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Propagation of 2019-nCoV&#46; There are various hypotheses regarding the virus&#8217; animal-to-human transmission&#44; the strongest of which is the bat origin&#46; Human-to-human transmission has been reported to occur through the respiratory tract&#44; thereby facilitating infection between populations&#46; The symptoms are very common&#44; with fever&#44; cough&#44; muscle pain and respiratory problems&#44; among others&#46;</p>"
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Review
COVID-19, a worldwide public health emergency
COVID-19, una emergencia de salud pública mundial
M. Palacios Cruza, E. Santosb, M.A. Velázquez Cervantesc, M. León Juárezc,
Corresponding author
moisesleoninper@gmail.com

Corresponding author.
a Facultad de Medicina, Universidad Veracruzana, Veracruz, Mexico
b Department of Neurosurgery, University of Heidelberg, Heidelberg, Germany
c Departamento de Inmunobioquímica, Laboratorio de Virología Perinatal, Instituto Nacional de Perinatología, Ciudad de México, Mexico
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<span class="elsevierStyleItalic">alpha&#44; beta&#44; delta</span> and <span class="elsevierStyleItalic">gamma&#46;</span> To date&#44; the <span class="elsevierStyleItalic">alpha</span> and <span class="elsevierStyleItalic">beta</span> types have been determined to infect humans&#44;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">5</span></a> causing diseases ranging from the common cold to more severe conditions&#44; such as Middle East respiratory syndrome &#40;MERS-CoV&#41; and severe acute respiratory syndrome &#40;SARS-CoV&#41;&#44; which caused thousands of deaths in 2002&#46;<a class="elsevierStyleCrossRefs" href="#bib0215"><span class="elsevierStyleSup">6&#44;7</span></a> Four of the human coronaviruses &#40;HCoV 229E&#44; NL63&#44; OC43 and HKU1&#41; are endemic worldwide and represent 10&#8211;30&#37; of upper respiratory tract infections in adults&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">5</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">Structurally&#44; coronaviruses are spherical or pleomorphic&#44; with diameters of 80&#8211;120<span class="elsevierStyleHsp" style=""></span>nm&#46; Various electronic microscope analyses have identified the surface of the virion&#44; discovering that they are structures organized by projections that in turn consist of viral spike &#40;S&#41; glycoprotein trimers&#46;<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">8</span></a> Additionally&#44; other short projections composed of hemagglutinin-esterase &#40;HE&#41; protein dimers have been identified&#44; which have been observed in some <span class="elsevierStyleItalic">beta-coronaviruses</span>&#46;<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">9</span></a> For its part&#44; the viral envelope is reinforced by the membrane &#40;M&#41; glycoprotein &#40;the most abundant on the virion&#39;s surface&#41;&#44; which is found embedded in the membrane by 3 transmembrane domains&#46;<a class="elsevierStyleCrossRef" href="#bib0235"><span class="elsevierStyleSup">10</span></a> Another structural component of the virion is the envelope &#40;E&#41; protein&#44; a small protein that is highly hydrophobic and is found to a small proportion than the other proteins&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">11</span></a> The viral proteins of the coronavirus are embedded in a lipid membrane that is created by the infected cells&#46; Internally&#44; the virus particle consists of an additional protein known as the nucleoprotein &#40;N&#41;&#44; which binds to the virus RNA in a helical structure similar to a beaded string&#44; thereby protecting the RNA from degradation &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>A&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">8</span></a></p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0035" class="elsevierStylePara elsevierViewall">The genome of coronaviruses is positive-polarity&#44; single-strand nonsegmented RNA &#40;&#43;ssRNA&#41;&#44; which measures 27 to 32<span class="elsevierStyleHsp" style=""></span>kilobases&#46; The genomic RNA presents certain changes such as polyadenylations in the 3&#8217; terminal region&#59; in contrast&#44; the 5&#8217; terminal region contains a cap structure&#46;<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">12</span></a> Within this RNA&#44; there are numerous open reading frames &#40;6&#8211;11 ORFs&#41;&#46; The first ORF encodes approximately 16 nonstructural proteins&#44; while the remaining ORFs encode accessory and nonstructural proteins &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>B&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">13</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">The genome sequence analyses for 2019-nCoV were fairly similar to those of SARS-CoV&#59; however&#44; there are certain differences such as the lack of the region encoding for protein 8<span class="elsevierStyleHsp" style=""></span>a in 2019-nCoV&#44; which could therefore have resulted in its lower pathogenesis when compared with SARS-CoV&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">14</span></a></p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Origin</span><p id="par0045" class="elsevierStylePara elsevierViewall">One unknown that is still being investigated is the virus&#8217; zoonotic origin&#46; Due to the close similarity between 2019-nCoV and bat coronaviruses&#44; it is likely that bats are the main reservoir for the virus&#46; Various studies were conducted when this new class of coronavirus appeared and discovered that 2019-nCoV is 96&#37; identical to a bat coronavirus at the genome level&#46; The same study revealed that this virus belongs to the SARS-CoV species&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">15</span></a> Thus&#44; it was speculated that SARS-CoV was transmitted to humans from exotic animals in markets in the outbreak 18 years ago&#44;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">15</span></a> while MERS-CoV was transmitted from camels to humans&#46;<a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">16</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">The reports documented that many of the first identified patients share the common factor of contact with a seafood and animal market&#59; however&#44; other patients had no contact with these locations at any time&#44; which shows the limited person-to-person infection after identifying groups of cases among families&#44; as well as transmission from patients to health workers&#46;<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">17</span></a> Moreover&#44; a recently published study estimated that 95&#37; of the cases of 2019-nCoV infections in Wuhan showed symptoms before the 12th of January 2020&#44;<a class="elsevierStyleCrossRefs" href="#bib0275"><span class="elsevierStyleSup">18&#44;19</span></a> a fact that&#44; combined with the virus&#8217; incubation period&#44; suggests a high possibility of the disease&#39;s travel-related propagation&#46;<a class="elsevierStyleCrossRefs" href="#bib0285"><span class="elsevierStyleSup">20&#44;21</span></a></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Transmission</span><p id="par0055" class="elsevierStylePara elsevierViewall">Generally&#44; coronaviruses replicate primarily in the epithelial cells of the lower respiratory tract and&#44; to a lesser extent&#44; in the cells of the upper respiratory tract&#46; Transmission therefore mainly occurs from patients with recognized disease and not from patients with mild and nonspecific signs&#59; in other words&#44; it is believed that propagation occurs only after the patient shows signs of the disease in the lower respiratory tract&#46;<a class="elsevierStyleCrossRefs" href="#bib0295"><span class="elsevierStyleSup">22&#44;23</span></a> However&#44; patients with 2019-nCoV infection detected in a severe or fatal state have a greater probability of transmitting this virus&#44; given that they expel a greater quantity of infectious particles than patients who have the mild or asymptomatic form of the infection&#46; Identifying and quarantining these patients in health centers where outbreaks have occurred&#44; along with the implementation of appropriate infection control and constant reports on cases from various countries&#44; have been effective in reducing the transmission and containing outbreaks of the disease&#46;<a class="elsevierStyleCrossRef" href="#bib0305"><span class="elsevierStyleSup">24</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">The mean number of new cases that a case of coronavirus generates over the course of its infectious period &#40;R<span class="elsevierStyleInf">0</span>&#41; varies between 2&#46;24 &#40;95&#37; CI 1&#46;96&#8211;2&#46;55&#41; and 3&#46;58 &#40;95&#37; CI 2&#46;89&#8211;4&#46;39&#41;&#44;<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">21</span></a> i&#46;e&#46;&#44; one individual can infect approximately 2 to 4 people&#44; which means that the infection can propagate rapidly and widely among the population &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0065" class="elsevierStylePara elsevierViewall">Who are most susceptible to the infection&#63; The novel coronavirus can infect people of all ages&#44; although the elderly and those with pre-existing medical conditions &#40;such as asthma&#44; diabetes and heart disease&#41; seem to be most vulnerable to falling seriously ill with the virus&#46; Thus&#44; the reported mortality rate for individuals older than 70 years is &#62;8&#37;&#46; According to reports&#44; the patients who died of this infection had a mean age of 56 years&#44; and most had other diseases &#40;heart disease&#44; stroke&#44; diabetes&#44; etc&#46;&#41;&#44; which could have made them more vulnerable to the virus&#46; The Chinese Center for Disease Control and Prevention reported that 1 to 2 men were infected for every woman&#46; It has been speculated that women&#39;s low susceptibility to the viral infections could be due to protection from their &#8220;extra&#8221; X chromosome&#46;<a class="elsevierStyleCrossRef" href="#bib0310"><span class="elsevierStyleSup">25</span></a> Children constitute a peculiar population with an immune system different from that of adults&#46; Virus transmission through their mothers with suspected or confirmed infection therefore occurs easily&#46;<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">26</span></a> However&#44; a lower severity and extremely low mortality has been observed&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Clinical presentation</span><p id="par0070" class="elsevierStylePara elsevierViewall">The diagnosis of the disease has been reached based on virus-induced pneumonia based on the clinical symptoms observed in the patients &#40;similar to that of other respiratory viruses&#41;&#44; to their history of exposure to other people with the virus&#44; and the history of visits to areas affected&#46;<a class="elsevierStyleCrossRefs" href="#bib0220"><span class="elsevierStyleSup">7&#44;27</span></a> Moreover&#44; a detailed study of the first 99 patients treated in the Wuhan Jinyintan Hospital&#44; conducted between the 1st and 20th of January 2020&#44; showed that of the 99 patients with 2019-nCoV pneumonia&#44; 49&#37; had a history of exposure to the Huanan seafood market and that 51&#37; had chronic diseases&#46; These patients&#8217; mean age was 55&#46;5 years&#44; 67 were men and 32 were women&#44; and the incubation period for the virus was estimated at 7&#8211;14 days&#46;<a class="elsevierStyleCrossRef" href="#bib0320"><span class="elsevierStyleSup">27</span></a> The analyzed patients had clinical manifestations of fever &#40;83&#37;&#41;&#44; cough &#40;82&#37;&#41;&#44; difficulty breathing &#40;31&#37;&#41;&#44; muscle pain &#40;11&#37;&#41;&#44; confusion &#40;9&#41;&#44; headache &#40;8&#37;&#41;&#44; sore throat &#40;5&#37;&#41;&#44; runny nose &#40;4&#37;&#41;&#44; chest pain &#40;2&#37;&#41;&#44; diarrhea &#40;2&#37;&#41;&#44; nausea and vomiting &#40;1&#37;&#41;&#46; According to imaging tests&#44; 75&#37; of these patients showed bilateral pneumonia&#44; 14&#37; showed significant mottling and ground-glass opacity&#44; and 1&#37; had pneumothorax&#46; Similarly&#44; 17&#37; developed acute respiratory distress syndrome&#44; of whom 11&#37; worsened in a short period and died due to multiple organ failure&#46;<a class="elsevierStyleCrossRefs" href="#bib0300"><span class="elsevierStyleSup">23&#44;28</span></a> Moreover&#44; the leukocyte counts were below the normal range in 9 of the patients and above the normal range in 24&#59; 38&#37; of them had above normal neutrophil counts&#46; The lymphocyte and hemoglobin counts were below the normal range for many of the patients&#44; and the platelet counts were below the normal range in 12&#37; of the patients and above normal in 4&#37;&#46; Forty-three of these patients had varying degrees of impaired hepatic function&#44; with alanine aminotransferase &#40;ALT&#41; or aspartate aminotransferase &#40;AST&#41; levels above the normal range&#46; One patient experienced severe hepatic function impairment&#46;<a class="elsevierStyleCrossRefs" href="#bib0325"><span class="elsevierStyleSup">28&#44;29</span></a></p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Classification of patients according to their clinical symptoms</span><p id="par0075" class="elsevierStylePara elsevierViewall">Considering the patients&#8217; clinical symptoms&#44; when should a 2019-nCoV case be labeled as suspected&#44; probable or confirmed&#63; According to the WHO&#44; a suspected case involves a patient with severe acute respiratory infection &#40;fever&#44; cough&#44; requiring hospitalization&#41; and with no other etiology that completely explains the clinical presentation&#44; as well as a history of travel or residence in China during the 14 days before symptom onset&#46; Alternatively&#44; a suspected case can involve a patient with an acute respiratory disease and at least one of the following factors during the 14 days prior to the onset of the symptoms&#58; &#40;a&#41; contact with a confirmed or probable case of 2019-nCoV infection or &#40;b&#41; working or attending a medical care center that was treating patients with confirmed or probable 2019-nCoV infection and patients with acute respiratory disease&#46; A probable case involves a patient whose 2019-nCoV tests are not conclusive or are positive using an assay for coronavirus but no laboratory evidence of other respiratory pathogens&#46; Finally&#44; confirmed cases involve patients with positive laboratory results for 2019-nCoV infection&#44; regardless of the signs and clinical symptoms&#46;<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">30</span></a></p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Clinical tests for the diagnosis</span><p id="par0080" class="elsevierStylePara elsevierViewall">Among the main priorities for facilitating public health interventions in patients is the laboratory diagnosis&#46; In the case of an acute respiratory infection&#44; the reverse transcription-polymerase chain reaction is commonly employed to identify the viruses that cause the respiratory secretions&#46;<a class="elsevierStyleCrossRefs" href="#bib0335"><span class="elsevierStyleSup">30&#44;31</span></a></p><p id="par0085" class="elsevierStylePara elsevierViewall">The test for detecting the viral envelope&#39;s gene sequence has been effectively implemented by 35 laboratories&#59; however&#44; the diagnostic algorithm employs other sequences of the viral genome to confirm positivity for 2019-nCoV by detecting gene sequences of the viral RNA polymerase and nucleoprotein&#46;<a class="elsevierStyleCrossRef" href="#bib0345"><span class="elsevierStyleSup">32</span></a></p><p id="par0090" class="elsevierStylePara elsevierViewall">Other samples to collect include&#8230;<ul class="elsevierStyleList" id="lis0005"><li class="elsevierStyleListItem" id="lsti0005"><span class="elsevierStyleLabel">&#40;a&#41;</span><p id="par0095" class="elsevierStylePara elsevierViewall">RNA extraction from clinical samples using the MagNA Pure 96 system&#46;</p></li><li class="elsevierStyleListItem" id="lsti0010"><span class="elsevierStyleLabel">&#40;b&#41;</span><p id="par0100" class="elsevierStylePara elsevierViewall">Respiratory material &#40;nasopharyngeal and oropharyngeal swabs for outpatients and sputum &#91;if presented&#93; and&#47;or endotracheal aspirate or bronchoalveolar lavage for patients with severe respiratory disease&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">33</span></a></p></li><li class="elsevierStyleListItem" id="lsti0015"><span class="elsevierStyleLabel">&#40;c&#41;</span><p id="par0105" class="elsevierStylePara elsevierViewall">Serum for serological tests&#44; acute samples and convalescent samples &#40;in addition to the respiratory material&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">33</span></a></p></li></ul></p><p id="par0110" class="elsevierStylePara elsevierViewall">The objectives of the diagnostic tests are to detect the common causes of early pneumonia&#44; to support disease control activities and to work with reference laboratories that can perform pancoronavirus detection and direct sequencing&#46;<a class="elsevierStyleCrossRef" href="#bib0340"><span class="elsevierStyleSup">31</span></a></p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Prevention measures</span><p id="par0115" class="elsevierStylePara elsevierViewall">The standard recommendations issued by the WHO for preventing the propagation of the infection include washing hands on a regular basis&#44; especially after contact with sick individuals or their environment&#44; covering the mouth and nose when coughing and sneezing&#44; cooking meat and eggs thoroughly&#44; avoiding close contact with any individual who presents symptoms of respiratory diseases &#40;coughing and sneezing&#41;&#44; avoiding traveling to affected cities and areas and avoiding close contact with live or dead farm animals or wild animals&#46; Travelers with symptoms of acute respiratory infection should practice coughing etiquette &#40;maintaining distance&#44; covering the mouth when coughing and sneezing into clothing or disposable tissues and thoroughly washing hands&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0220"><span class="elsevierStyleSup">7&#44;34&#44;35</span></a></p><p id="par0120" class="elsevierStylePara elsevierViewall">Those individuals who have had contact with patients categorized as having probable and&#47;or confirmed 2019-nCoV infection should be monitored for 14 days from the last unprotected contact they had with infected individuals and should limit their travel to locations beyond their residence to avoid possible propagation&#46;</p><p id="par0125" class="elsevierStylePara elsevierViewall">One of the most widely used preventive measures is face masks&#44; but can they stop the propagation&#63; Surgical face masks for the public are not 100&#37; effective protection against airborne viruses or bacteria&#44; because the masks do not have an adequate air filter and leave the eyes exposed&#46; Although face masks can help reduce the risk of contracting the virus through sneezing or coughing from others&#44; the optimal solution is respirators with specialized air filters&#44; because they are designed specifically to protect individuals against potentially dangerous airborne particles&#46; These are known as filtering face piece &#40;FFP&#41; face masks&#44; of the which there are 3 types&#58;<ul class="elsevierStyleList" id="lis0010"><li class="elsevierStyleListItem" id="lsti0020"><span class="elsevierStyleLabel">&#8226;</span><p id="par0130" class="elsevierStylePara elsevierViewall">FFP1 &#8211; filters approximately 78&#37; of air particles&#44; thereby protecting against nontoxic and nonfibrogenic residues of dust and aerosols and preventing the inhalation of bothersome residues and smells&#46;</p></li><li class="elsevierStyleListItem" id="lsti0025"><span class="elsevierStyleLabel">&#8226;</span><p id="par0135" class="elsevierStylePara elsevierViewall">FFP2 &#8211; filters approximately 92&#37; of air particles&#44; protecting against nontoxic residues and fibrogenic elements&#44; preventing the inhalation of toxic fluids of dust&#44; aerosols and fumes&#46;</p></li><li class="elsevierStyleListItem" id="lsti0030"><span class="elsevierStyleLabel">&#8226;</span><p id="par0140" class="elsevierStylePara elsevierViewall">FFP3 &#8211; filters 98&#37; of air particles&#44; protecting against poisons and toxins of dust&#44; smoke and aerosols&#44; as well as bacteria&#44; viruses and fungal spores&#46;</p></li></ul></p><p id="par0145" class="elsevierStylePara elsevierViewall">For isolation procedures and where infectious aerosols &#40;e&#46;g&#46;&#44; tuberculosis&#44; measles&#44; chickenpox&#44; SARS&#41; might be generated&#44; the WHO recommends using a ventilator with a filtration efficiency of at least 95&#37; for 0&#46;3<span class="elsevierStyleHsp" style=""></span>&#956;m diameter particles&#44; which is equivalent to an N95 facemask&#44; according to the US National Institute for Occupational Safety and Health &#40;NIOSH&#41; regulations&#46; Given that the US regulations differ from the European&#44; this level of protection for the general population is between FFP2 and FFP3&#46;</p><p id="par0155" class="elsevierStylePara elsevierViewall">In general&#44; the use of masks is recommended only if there is exposure to patients with respiratory diseases&#44; such as in hospitals and medical offices&#46; The guidelines for mask use should be strictly followed when exposing individuals to infected patients&#44; because poor handling and touching the eyes with the hands and with the edge of the mask increase the risks&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Who should be notified if there are confirmed cases or an infection is suspected&#63;</span><p id="par0160" class="elsevierStylePara elsevierViewall">Any individual who has been in contact with patients and who meets the clinical characteristics of the disease becomes a suspected case and should be confirmed through laboratory tests&#46;<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">30</span></a> The WHO requests that national authorities report confirmed cases of novel coronavirus infection within 24<span class="elsevierStyleHsp" style=""></span>h of identifying them and provide the patients&#8217; minimum basic data set&#46;<a class="elsevierStyleCrossRef" href="#bib0335"><span class="elsevierStyleSup">30</span></a> For Mexico&#44; cases of patients with signs and symptoms of the disease can be reported to the Epidemiological and Health Intelligence Unit &#40;<span class="elsevierStyleItalic">Unidad de Inteligencia Epidemiol&#243;gica y Sanitaria</span>&#44; UIES&#41;&#44; 24<span class="elsevierStyleHsp" style=""></span>h a day&#44; 7 days a week&#44; at &#40;&#43;52&#41; 800<span class="elsevierStyleHsp" style=""></span>0044<span class="elsevierStyleHsp" style=""></span>800&#46; In Spain&#44; cases should be reported in Madrid to the Ministry of Health &#40;<span class="elsevierStyleItalic">Ministerio de Sanidad</span>&#41; at &#40;&#43;34&#41; 91<span class="elsevierStyleHsp" style=""></span>596<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleHsp" style=""></span>00 or to the National Institute of Healthcare Management &#40;<span class="elsevierStyleItalic">Instituto Nacional de Gesti&#243;n Sanitaria</span>&#41;&#44; at &#40;&#43;34&#41; 91<span class="elsevierStyleHsp" style=""></span>338<span class="elsevierStyleHsp" style=""></span>00<span class="elsevierStyleHsp" style=""></span>00&#46;</p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Treatment</span><p id="par0165" class="elsevierStylePara elsevierViewall">Meanwhile&#44; numerous research laboratories are currently seeking a treatment that can eliminate the MERS-CoV infection&#44; either with the drugs that are already part of the pharmaceutical industry and are being employed for other diseases or by searching for new more specific alternatives for the virus&#44; given that there is currently no specific vaccine or treatment&#44; although there are several specific vaccines and treatments in the development phase&#46;</p><p id="par0170" class="elsevierStylePara elsevierViewall">Despite the short time&#44; it has been predicted that a vaccine will be ready for animal testing in approximately a month and that in 3 months it could be ready for humans&#46; For now&#44; the treatment is only supportive and depends on the patient&#39;s clinical condition&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">36</span></a></p><p id="par0175" class="elsevierStylePara elsevierViewall">Broad-spectrum antivirals&#44; such as remdesivir&#44; lopinavir&#47;ritonavir and interferon beta&#44; have shown promise against MERS-CoV in animal models&#44; and their activity against the present 2019-nCoV is being evaluated&#46;<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">36</span></a> Scientists at the Vaccine Research Center of the National Institute of Allergy and Infectious Diseases of Washington DC have employed approaches that use nucleic acid-based vaccine platforms to counter the infection&#46;<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">37</span></a></p></span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Conclusion</span><p id="par0180" class="elsevierStylePara elsevierViewall">The WHO is collaborating with specialists in public health and animal health&#44; clinicians and scientists from around the world to meet and exchange scientific data to better understand the virus and the disease it causes&#46; An example of these data is the identification of new secretion pathways in infected patients&#46; Similarly&#44; the WHO has focused on determining the priorities in the response to outbreaks&#44; the therapeutic strategies for treatment and the approaches for clinical care&#46; There are analyses that suggest that certain SARS-CoV-specific monoclonal antibodies can be effective in neutralizing 2019-nCoV&#46;</p><p id="par0185" class="elsevierStylePara elsevierViewall">Undoubtedly&#44; it is everyone&#39;s task to help contain the outbreaks that have emerged in so short of a time&#46; It is therefore advisable that the general population follow all recommendations for preventing the infection&#46; Although the number of cases of infection outside of China are relatively low compared to the numbers within the country&#44; every country should be prepared for any situation related to this virus&#46;</p></span></span>"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">A new coronavirus outbreak emerged on the 31st of December 2019 in Wuhan&#44; China&#44; causing commotion among the medical community and the rest of the world&#46; This new species of coronavirus has been termed 2019-nCoV and has caused a considerable number of cases of infection and deaths in China and&#44; to a growing degree&#44; beyond China&#44; becoming a worldwide public health emergency&#46; 2019-nCoV has high homology to other pathogenic coronaviruses&#44; such as those originating from bat-related zoonosis &#40;SARS-CoV&#41;&#44; which caused approximately 646 deaths in China at the start of the decade&#46; The mortality rate for 2019-nCoV is not as high &#40;approximately 2&#8211;3&#37;&#41;&#44; but its rapid propagation has resulted in the activation of protocols to stop its spread&#46; This pathogen has the potential to become a pandemic&#46; It is therefore vital to follow the personal care recommendations issued by the World Health Organization&#46;</p></span>"
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        "titulo" => "Resumen"
        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Un nuevo brote de coronavirus surgi&#243; el pasado 31 de diciembre de 2019 en Wuhan&#44; China&#44; causando conmoci&#243;n entre la comunidad m&#233;dica y el resto del mundo&#46; Esta nueva especie de coronavirus fue denominada como 2019-nCoV&#44; causante de un gran n&#250;mero de casos y fallecimientos en China y en cantidad creciente fuera de ella&#44; convirti&#233;ndose en una emergencia de salud p&#250;blica a nivel mundial&#46; 2019-nCoV es un virus con alta homolog&#237;a con otros coronavirus patog&#233;nicos&#44; como los originados por zoonosis con murci&#233;lagos &#40;SARS-CoV&#41; causantes de aproximadamente 646 muertes en China a principios de la d&#233;cada&#46; Su tasa de mortalidad no es tan elevada &#40;aproximadamente del 2&#8211;3&#37;&#41;&#44; pero su r&#225;pida propagaci&#243;n ha propiciado la activaci&#243;n de protocolos para detener su diseminaci&#243;n&#46; Este pat&#243;geno tiene el potencial para convertirse en pandemia&#44; por lo que es vital seguir las recomendaciones de cuidado personal dictadas por la Organizaci&#243;n Mundial de la Salud&#46;</p></span>"
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      0 => array:2 [
        "etiqueta" => "&#9734;"
        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Palacios Cruz M&#44; Santos E&#44; Vel&#225;zquez Cervantes MA&#44; Le&#243;n Ju&#225;rez M&#46; COVID-19&#44; una emergencia de salud p&#250;blica mundial&#46; Rev Clin Esp&#46; 2021&#59;221&#58;55&#8211;61&#46;</p>"
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          "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">&#40;A&#41; Coronavirus particle&#46; This type of virus contains positive-polarity single-strand RNA &#91;&#40;&#43;&#41;ssRNA&#93; genetic material&#44; measuring 27&#8211;32<span class="elsevierStyleHsp" style=""></span>kilobases&#46; The virus consists of a nucleocapsid&#44; which in turn is composed of &#40;&#43;&#41;ssRNA and the nucleoprotein&#46; This structure is covered by a lipid bilayer&#46; Other structural proteins of the coronavirus are found here&#44; such as the spike protein&#44; which covers this virus particle&#44; as well as hemagglutinin-esterase &#40;HE&#41; dimers&#44; the highly hydrophobic envelope &#40;E&#41; protein and the membrane &#40;M&#41; protein&#44; the most abundant protein on the virion&#39;s surface&#46; &#40;B&#41; Organization of the genes in the 2019-nCoV genome&#46; The structural genes are shown in pink&#44; and the nonstructural genes are shown in blue&#46;</p>"
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          "en" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Propagation of 2019-nCoV&#46; There are various hypotheses regarding the virus&#8217; animal-to-human transmission&#44; the strongest of which is the bat origin&#46; Human-to-human transmission has been reported to occur through the respiratory tract&#44; thereby facilitating infection between populations&#46; The symptoms are very common&#44; with fever&#44; cough&#44; muscle pain and respiratory problems&#44; among others&#46;</p>"
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Article information
ISSN: 22548874
Original language: English
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2021 August 184 48 232
2021 July 123 66 189
2021 June 128 49 177
2021 May 155 61 216
2021 April 273 134 407
2021 March 189 62 251
2021 February 227 47 274
2021 January 189 37 226
2020 December 114 24 138
2020 November 120 32 152
2020 October 82 14 96
2020 September 115 32 147
2020 August 87 25 112
2020 July 110 33 143
2020 June 110 19 129
2020 May 216 33 249
2020 April 287 45 332
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¿Es usted profesional sanitario apto para prescribir o dispensar medicamentos?

Are you a health professional able to prescribe or dispense drugs?