Volume 26, Number 7—July 2020
Online Report
Evidence Supporting Transmission of Severe Acute Respiratory Syndrome Coronavirus 2 While Presymptomatic or Asymptomatic
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.
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