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full-text provider logoElsevier Science
<https://linkinghub.elsevier.com/retrieve/pii/S0954-6111(20)30166-9>Free
PMC article <https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/32513410/>
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Respir Med

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. 2020 Aug;169:106026.
doi: 10.1016/j.rmed.2020.106026. Epub 2020 May 13.


  A study on infectivity of asymptomatic SARS-CoV-2 carriers

Ming Gao
<https://pubmed.ncbi.nlm.nih.gov/?term=Gao+M&cauthor_id=32513410>^ 1
<#affiliation-1> , Lihui Yang
<https://pubmed.ncbi.nlm.nih.gov/?term=Yang+L&cauthor_id=32513410>^ 2
<#affiliation-2> , Xuefu Chen
<https://pubmed.ncbi.nlm.nih.gov/?term=Chen+X&cauthor_id=32513410>^ 3
<#affiliation-3> , Yiyu Deng
<https://pubmed.ncbi.nlm.nih.gov/?term=Deng+Y&cauthor_id=32513410>^ 4
<#affiliation-4> , Shifang Yang
<https://pubmed.ncbi.nlm.nih.gov/?term=Yang+S&cauthor_id=32513410>^ 5
<#affiliation-5> , Hanyi Xu
<https://pubmed.ncbi.nlm.nih.gov/?term=Xu+H&cauthor_id=32513410>^ 6
<#affiliation-6> , Zixing Chen
<https://pubmed.ncbi.nlm.nih.gov/?term=Chen+Z&cauthor_id=32513410>^ 7
<#affiliation-7> , Xinglin Gao
<https://pubmed.ncbi.nlm.nih.gov/?term=Gao+X&cauthor_id=32513410>^ 8
<#affiliation-8>
Affiliations Expand


      Affiliations

  *
    ^1

    The Second School of Clinical Medicine, Southern Medical University,
    Guangdong Provincial People's Hospital, Guangdong Academy of Medical
    Sciences, Guangzhou, 510515, China. Electronic address:
    741621766@qq.com.
  *
    ^2

    Hospital Infection Control Division, Guangdong Provincial People's
    Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080,
    China. Electronic address: smylh007@163.com.
  *
    ^3

    Department of Infectious Disease, Guangdong Provincial People's
    Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080,
    China. Electronic address: chenxuefu1992@163.com.
  *
    ^4

    Guangdong Provincial People's Hospital, Guangdong Academy of Medical
    Sciences, School of Medicine, South China University of Technology,
    Guangzhou, 510080, China. Electronic address: yiyudeng666@163.com.
  *
    ^5

    Department of Respiratory and Critical Care Medicine, Guangdong
    Provincial People's Hospital, Guangdong Academy of Medical Sciences,
    Guangdong Provincial Geriatrics Institute, Guangzhou, 510080, China.
    Electronic address: huanjunyang82@163.com.
  *
    ^6

    Department of Respiratory and Critical Care Medicine, Guangdong
    Provincial People's Hospital, Guangdong Academy of Medical Sciences,
    Guangdong Provincial Geriatrics Institute, Guangzhou, 510080, China.
    Electronic address: yixu360@126.com.
  *
    ^7

    Department of Respiratory and Critical Care Medicine, Guangdong
    Provincial People's Hospital, Guangdong Academy of Medical Sciences,
    Guangdong Provincial Geriatrics Institute, Guangzhou, 510080, China.
    Electronic address: 1208843244@qq.com.
  *
    ^8

    Department of Respiratory and Critical Care Medicine, Guangdong
    Provincial People's Hospital, Guangdong Academy of Medical Sciences,
    Guangdong Provincial Geriatrics Institute, Guangzhou, 510080, China.
    Electronic address: xinglingao@hotmail.com.

  * PMID: *32513410*
  * PMCID: PMC7219423
    <http://www.ncbi.nlm.nih.gov/pmc/articles/pmc7219423/>
  * DOI: 10.1016/j.rmed.2020.106026
    <https://doi.org/10.1016/j.rmed.2020.106026>

Free PMC article Item in Clipboard


  A study on infectivity of asymptomatic SARS-CoV-2 carriers

Ming Gao et al. Respir Med. 2020 Aug.
Free PMC article Show details
Respir Med

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. 2020 Aug;169:106026.
doi: 10.1016/j.rmed.2020.106026. Epub 2020 May 13.


      Authors

Ming Gao
<https://pubmed.ncbi.nlm.nih.gov/?term=Gao+M&cauthor_id=32513410>^ 1
<#affiliation-1> , Lihui Yang
<https://pubmed.ncbi.nlm.nih.gov/?term=Yang+L&cauthor_id=32513410>^ 2
<#affiliation-2> , Xuefu Chen
<https://pubmed.ncbi.nlm.nih.gov/?term=Chen+X&cauthor_id=32513410>^ 3
<#affiliation-3> , Yiyu Deng
<https://pubmed.ncbi.nlm.nih.gov/?term=Deng+Y&cauthor_id=32513410>^ 4
<#affiliation-4> , Shifang Yang
<https://pubmed.ncbi.nlm.nih.gov/?term=Yang+S&cauthor_id=32513410>^ 5
<#affiliation-5> , Hanyi Xu
<https://pubmed.ncbi.nlm.nih.gov/?term=Xu+H&cauthor_id=32513410>^ 6
<#affiliation-6> , Zixing Chen
<https://pubmed.ncbi.nlm.nih.gov/?term=Chen+Z&cauthor_id=32513410>^ 7
<#affiliation-7> , Xinglin Gao
<https://pubmed.ncbi.nlm.nih.gov/?term=Gao+X&cauthor_id=32513410>^ 8
<#affiliation-8>


      Affiliations

  *
    ^1

    The Second School of Clinical Medicine, Southern Medical University,
    Guangdong Provincial People's Hospital, Guangdong Academy of Medical
    Sciences, Guangzhou, 510515, China. Electronic address:
    741621766@qq.com.
  *
    ^2

    Hospital Infection Control Division, Guangdong Provincial People's
    Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080,
    China. Electronic address: smylh007@163.com.
  *
    ^3

    Department of Infectious Disease, Guangdong Provincial People's
    Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080,
    China. Electronic address: chenxuefu1992@163.com.
  *
    ^4

    Guangdong Provincial People's Hospital, Guangdong Academy of Medical
    Sciences, School of Medicine, South China University of Technology,
    Guangzhou, 510080, China. Electronic address: yiyudeng666@163.com.
  *
    ^5

    Department of Respiratory and Critical Care Medicine, Guangdong
    Provincial People's Hospital, Guangdong Academy of Medical Sciences,
    Guangdong Provincial Geriatrics Institute, Guangzhou, 510080, China.
    Electronic address: huanjunyang82@163.com.
  *
    ^6

    Department of Respiratory and Critical Care Medicine, Guangdong
    Provincial People's Hospital, Guangdong Academy of Medical Sciences,
    Guangdong Provincial Geriatrics Institute, Guangzhou, 510080, China.
    Electronic address: yixu360@126.com.
  *
    ^7

    Department of Respiratory and Critical Care Medicine, Guangdong
    Provincial People's Hospital, Guangdong Academy of Medical Sciences,
    Guangdong Provincial Geriatrics Institute, Guangzhou, 510080, China.
    Electronic address: 1208843244@qq.com.
  *
    ^8

    Department of Respiratory and Critical Care Medicine, Guangdong
    Provincial People's Hospital, Guangdong Academy of Medical Sciences,
    Guangdong Provincial Geriatrics Institute, Guangzhou, 510080, China.
    Electronic address: xinglingao@hotmail.com.

  * PMID: *32513410*
  * PMCID: PMC7219423
    <http://www.ncbi.nlm.nih.gov/pmc/articles/pmc7219423/>
  * DOI: 10.1016/j.rmed.2020.106026
    <https://doi.org/10.1016/j.rmed.2020.106026>

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    Abstract

*Background: * An ongoing outbreak of coronavirus disease 2019
(COVID-19) has spread around the world. It is debatable whether
asymptomatic COVID-19 virus carriers are contagious. We report here a
case of the asymptomatic patient and present clinical characteristics of
455 contacts, which aims to study the infectivity of asymptomatic carriers.

*Material and methods: * 455 contacts who were exposed to the
asymptomatic COVID-19 virus carrier became the subjects of our research.
They were divided into three groups: 35 patients, 196 family members and
224 hospital staffs. We extracted their epidemiological information,
clinical records, auxiliary examination results and therapeutic schedules.

*Results: * The median contact time for patients was four days and that
for family members was five days. Cardiovascular disease accounted for
25% among original diseases of patients. Apart from hospital staffs,
both patients and family members were isolated medically. During the
quarantine, seven patients plus one family member appeared new
respiratory symptoms, where fever was the most common one. The blood
counts in most contacts were within a normal range. All CT images showed
no sign of COVID-19 infection. No severe acute respiratory syndrome
coronavirus 2 (SARS-CoV-2) infections was detected in 455 contacts by
nucleic acid test.

*Conclusion: * In summary, all the 455 contacts were excluded from
SARS-CoV-2 infection and we conclude that the infectivity of some
asymptomatic SARS-CoV-2 carriers might be weak.

*Keywords: * Asymptomatic carrier; Contacts; Infectivity; SARS-CoV-2.

Copyright © 2020 Elsevier Ltd. All rights reserved.


      Conflict of interest statement

Declaration of competing interest The authors declare that they have no
known competing financial interests or personal relationships that could
have appeared to influence the work reported in this paper.


      Figures

Fig. 1
<https://www.ncbi.nlm.nih.gov/pmc/articles/instance/7219423/bin/gr1_lrg.jpg>

*

Fig. 1 * 5 *Chest CT images of Case… *
*

Fig. 1 * 13 *Chest CT images of Case A. * Figure a and c were taken on…
*Fig. 1* *Chest CT images of Case A.* Figure a and c were taken on
February 11, which showed non- COVID-19 imaging feature. Case A
underwent a CT scan again on February 22. Figure b and d, the follow-up
images, showed no significant differences than before.

See this image and copyright information in PMC <#>


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