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Volume 26, Number 7—July 2020
Online Report

Evidence Supporting Transmission of Severe Acute Respiratory Syndrome Coronavirus 2 While Presymptomatic or Asymptomatic

Nathan W. FurukawaComments to Author , John T. Brooks, and Jeremy Sobel
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA

Main Article

Table 1

Summary of epidemiologic reports supporting transmission of severe acute respiratory syndrome coronavirus 2 while asymptomatic or presymptomatic*

Ref. Setting Primary patient age, y/sex Primary patient exposure Transmission type Time from primary patient exposure to symptoms, d Secondary patient exposure Limitations/strengths
(9)
Xuzhou, China
56/M
Traveled through Wuhan
Presymptomatic
>5
3 family household members, 3 hospital contacts
L: Possible exposure while visiting a hospital; unclear exposure to the primary patient by the hospital cluster; possible undetected community transmission.
(10)
Zhoushan, China
45/M
Lived in Wuhan
Presymptomatic
>3
2 work colleagues sharing dinner
L: Possible exposure from other conference attendees.
(11)
Shanghai, China
65/F, 69/M
Lived in Wuhan
Presymptomatic
6
2 family household members
L: Possible undetected community transmission.
(12)
Luzhou, China
50/M, 51/F, 23/M
Lived in Wuhan
Presymptomatic
>9
2 family members sharing dinner
L: Possible undetected community transmission.
(13)
Anyang, China
20/F
Lived in Wuhan, China
Asymptomatic
NA
5 family household members
L: Initial negative RT-PCR in the primary case; possible undetected community transmission; possible exposure while visiting a hospital.
(14)
Nanjing, China
67/M
Traveled to Hubei Province, China
Asymptomatic
NA
3 family household members
L: Possible undetected community transmission.
(15)
Beijing, China
48/M
Traveled to Wuhan
Asymptomatic
NA
3 family household members sharing a dinner
L: Possible undetected community transmission.
(16)
Guangzhou, China
35/M
Lived in Wuhan
Presymptomatic or asymptomatic
>4
2 family household members
L: Possible infection while the family was in Wuhan; primary patient could have been the wife or son.
(17)
Zhejiang, China
58/F,
60/M
Attended Zhejiang Chinese Spring Festival
Presymptomatic or asymptomatic
5
4 family household members
L: Unclear nature of the primary patients’ initial exposure during the visit to a temple; possible undetected community transmission.
(18)
Munich, Germany
33/M
Visiting colleague from China was sick
Presymptomatic
3
2 work colleagues
S: The 2 secondary cases had no contact with the sick colleague from China; no community spread in Germany at the time.
(19) Singapore 55/F,
56/M Visited Wuhan as tourists Presymptomatic >4 3 church attendees S: Limited community spread in Singapore during this time.
Singapore 54/F Had dinner with confirmed case-patient Presymptomatic 11 1 classmate in a singing class
Singapore 53/F Had contact with confirmed case-patient Presymptomatic 8 1 family household member
Singapore 37/M Traveled to the Philippines Presymptomatic >6 1 family household member
Singapore 32/M Traveled to Japan Presymptomatic >3 1 household member
Singapore 58/F Had contact with confirmed case-patient Presymptomatic 5 2 church attendees
Singapore 63/M Traveled to Indonesia Presymptomatic >2 1 acquaintance with close contact

*L, limitation; NA, not applicable; ref., reference; RT-PCR: reverse-transcription PCR; S, strength.

Main Article

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Page created: May 04, 2020
Page updated: June 18, 2020
Page reviewed: June 18, 2020
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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