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==<span id="asymptomaticcarriers">Asymptomatic carriers</span>== [[File:Covid-19-virus.png|thumb|upright=0.4|'''The SARS-CoV-2 virus causes COVID-19.'''<br>Author: CDC]] A number of studies have found that some people who test positive for COVID-19 do not have any symptoms of illness or a raised temperature, and have normal blood test results, but are able to infect others, some of whom developed severe COVID-19 [[pneumonia]] as a result of COVID-19.<ref name="Bai2020">{{Cite journal | last = Bai | first = Yan | last2 = Yao | first2 = Lingsheng | last3 = Wei | first3 = Tao | last4 = Tian | first4 = Fei | last5 = Jin | first5 = Dong-Yan | last6 = Chen | first6 = Lijuan | last7 = Wang | first7 = Meiyun | date = 2020-02-21 | title = Presumed Asymptomatic Carrier Transmission of COVID-19 | url = https://jamanetwork.com/journals/jama/fullarticle/2762028 | journal = JAMA|language=en|doi=10.1001/jama.2020.2565}}</ref><ref name="Chan2019">{{Cite journal | last = Chan | first = Jasper Fuk-Woo | last2 = Yuan | first2 = Shuofeng | last3 = Kok | first3 = Kin-Hang | last4 = To | first4 = Kelvin Kai-Wang | last5 = Chu | first5 = Hin | last6 = Yang | first6 = Jin | last7 = Xing | first7 = Fanfan | last8 = Liu | first8 = Jieling | last9 = Yip | first9 = Cyril Chik-Yan | date = 2020-02-15 | title = A familial cluster of pneumonia associated with the 2019 novel coronavirus indicating person-to-person transmission: a study of a family cluster |url =https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)30154-9/abstract | journal = The Lancet|language=English | volume = 395 | issue = 10223 | pages = 514β523|doi=10.1016/S0140-6736(20)30154-9|issn=0140-6736|pmid=31986261}}</ref><ref name="delRio2020">{{Cite journal | last = del Rio | first = Carlos | author-link = | last2 = Malani | first2 = Preeti N. | author-link2 = | date = 2020-02-28 | title = COVID-19βNew Insights on a Rapidly Changing Epidemic | url = https://jamanetwork.com/journals/jama/fullarticle/2762510 | journal = JAMA|language=en | volume = | issue = | pages = |doi=10.1001/jama.2020.3072|pmc=|pmid=|access-date=|quote=|via=}}</ref> Some asymptomatic carriers have abnormal chest CT scans, and some do not. False negative tests have also been reported.<ref name="Bai2020" /><ref name="Chan2019" /> Estimates of the number of asymptomatic carriers vary wildly. Mizumoto et al. (2020) estimated that asymptomatic carriers accounted for 17.9% of the COVID-19 positive people on the ''Diamond Princess'' cruise ship, which was quarantined for 14 day after a previous passenger developed the illness.<ref name="Mizumoto" />
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