Table 1.
Numbers of asymptomatic and presymptomatic cases at the time of testing and infectious statusa
| Study | Asymptomatic at the time of testing, n/N (%) | Asymptomatic infectious, n/N (%) | Presymptomatic infectious, n/N (%) | Population/setting |
|---|---|---|---|---|
| Arons | 27/48 (56.3) | 1/3 (33.3) | 17/24 (70.8) | Skilled nursing home facility |
| Borges | 39/48 (81.3) | N/A | N/A | Non-COVID-19 hospital ward |
| Cordery | 3/13 (23.1) | No viral growth | Children and young people in school settings | |
| De Laval | 3/24 (12.5) | N/A | N/A | Military support facility cases and contacts |
| Ferreria | N/A | N/A | N/A | Healthcare workers |
| Gettings | 30/139 (21.6) | N/A | N/A | Students and staff in school |
| Hershow | 18/56 (32.1) | N/A | N/A | Students and staff in elementary schools |
| Jeffery Smith | 16/16 (100) | N/A | N/A | Care home |
| Lewis | 2/12 (16.7) | N/A | No culturable and potentially infectious virus could be isolated | Households |
| Murata | 90/90 (100) | 7/39 (17.9) | Passengers disembarking from the Diamond Princess cruise ship | |
| Pray | 7/39 (17.9) | 6/32 (18.8) | University campus | |
| Soto | 8/30 (26.7) | N/A | N/A | Emergency childcare centre contacts |
| Speake | 22/29 (75.9) | 4/11 (36.4) | N/A | Passengers on a flight |
| Surie | 11/17 (65) | One participant became symptomatic on day 3 after the first possible (RT-PCR positive) test and was culture-positive on the day of the initial test. One severely immunocompromised participant shed replication-competent virus for 19 days from the positive test (17 days from symptom onset)b | Nursing home residents | |
| Taylor | 17/24 (70.8) | 6/7 (85.7) | Army barracks | |
| Van Hensbergen | 3/19 (15.8)c | N/A | N/A | Long-term care facility |
| Wallace | 49/111 (44.1) | 12/52 (23.1) | 2/3 (66.7) | Detainees in a detention centre |
N/A = culture not attempted.
a
The studies report replicating SARS-CoV-2 from viral culture.
b
Data in Fig. 1 in the paper identifies the immunocompromised patient as participant Q and the individual who became symptomatic on day 3 as participant K.
c
Asymptomatic (potentially presymptomatic).