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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
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