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Severe acute respiratory syndrome coronavirus 2
(section)
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==Comparison with SARS and influenza== [[File:COVID-19_coronavirus_drawing.png|thumb|right|'''SARS-CoV-2 coronavirus: artistic drawing of the structure and cross-section.'''<br>Author: [https://doi.org/10.1128/mSystems.00245-20 Dietz et al (2020), mSystems 5:e00245-20.]]] The SARS-CoV-2 virus that causes COVID-19 illness is closely related to SARS-CoV: the coronavirus that causes Severe Acute Respiratory Syndrome.<ref name="genome">{{Cite journal | last = Chan | first=Jasper Fuk-Woo | last2 = Kok | first2 = Kin-Hang | last3 = Zhu | first3 = Zheng | last4 = Chu | first4 = Hin| last5 = To | first5 = Kelvin Kai-Wang | last6 = Yuan | first6 = Shuofeng | last7 = Yuen | first7 = Kwok-Yung | date = 2020 | title=Genomic characterization of the 2019 novel human-pathogenic coronavirus isolated from a patient with atypical pneumonia after visiting Wuhan|url=https://pubmed.ncbi.nlm.nih.gov/31987001/|journal=Emerging Microbes & Infections|volume=9|issue=1|pages=221–236|doi=10.1080/22221751.2020.1719902|issn=2222-1751|pmc=7067204|pmid=31987001}}</ref> The genome of the SARS-COV-2 virus was found to have 82% similarity with the virus that causes SARS.<ref name="genome" /> The SARS-CoV-2 virus appears to be significantly more contagious than the SARS-CoV virus that causes SARS, and spreads significantly in the community, unlike SARS-CoV which spread more in hospitals, healthcare settings and nursing homes than in the wider community.<ref name="COVID-19">{{Cite journal|url=https://academic.oup.com/jtm/article/doi/10.1093/jtm/taaa021/5735319 | title = The reproduction number of COVID-19 is higher compared to SARS coronavidus | last = Liu | first = Ying | authorlink= | last2 = Gayle | first2 = Albert A. | authorlink2 = | date = Mar 2020|doi=10.1093/jtm/taaa021|pmc=PMC7074654|pmid=32052846|archive-url=|archive-date=|url-status= | last3 = Wilder-Smith | first3 = Annelies | last4 = Rocklöv | first4 = Joachim|volume=27|issue=2|journal=Journal of Travel Medicine}}</ref><ref name="Wilder2019">{{Cite journal | last = Wilder-Smith | first = Annelies | last2 = Chiew | first2 = Calvin J. | last3 = Lee | first3 = Vernon J. | date = 2020-05-01 | title = Can we contain the COVID-19 outbreak with the same measures as for SARS?|url=https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30129-8/abstract|journal=The Lancet Infectious Diseases|language=English|volume=20|issue=5| pages = e102–e107|doi=10.1016/S1473-3099(20)30129-8|issn=1473-3099|pmid=32145768}}</ref> The resulting COVID-19 illness has a lower risk of death than SARS, but has killed a much higher number of people.<ref>{{Cite web|url=https://www.cdc.gov/sars/about/faq.html | title = SARS {{!}} Frequently Asked Questions {{!}}| date = 2019-02-08 | website = [[Centers for Disease Control and Prevention]]|language=en-us|access-date=2020-05-10 | last = | first = | authorlink = |archive-url=|archive-date=|url-status=}}</ref><ref>{{Cite web|url=https://coronavirus.jhu.edu/map.html | title = COVID-19 Map|website=Johns Hopkins Coronavirus Resource Center|language=en|access-date=2020-05-10}}</ref> Both COVID-19 and SARS are many times more likely to kill than seasonal flu illnesses.<ref name=":0">{{Cite news | url=https://www.livescience.com/new-coronavirus-compare-with-flu.html | title = How does the new coronavirus compare with the flu? | last = Rettner | first = Rachael| date = 2020-04-30|work=Live Science|access-date=2020-05-10|archive-url=|archive-date=|url-status=|quote=}}</ref><ref>{{Cite web|url=https://www.who.int/emergencies/diseases/novel-coronavirus-2019/question-and-answers-hub/q-a-detail/q-a-similarities-and-differences-covid-19-and-influenza | title = Q&A: Similarities and differences – COVID-19 and influenza | last = World Health Organization | first= | authorlink = | date = 2020-03-17 | website = World Health Organization|archive-url=|archive-date=|url-status=|access-date=2020-05-10}}</ref> COVID-19 also has a much longer incubation period than the flu, so people may infect others before they are aware they are ill.<ref name=":0" />
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