Table 2. Detection of Sudden Acute Respiratory Syndrome Coronavirus 2 by Sampling Method and Days from Symptom Onset to Study Sample Collection in Stanford, California, March 2020.
Participant | Time from self-reported symptom onset, d | Self-collected nasal swab | Physician-collected nasal swab | Physician-collected oropharyngeal swab |
---|---|---|---|---|
1 | 18 | Detected | Detected | Detected |
2 | 10 | Not detected | Not detected | Not detected |
3 | 8 | Detected | Detected | Detected |
4 | 13 | Detected | Detected | Detected |
5 | 22 | Not detected | Not detected | Not detected |
6 | 9 | Not detected | Not detected | Not detected |
7 | NAa | Not detected | Not detected | Not detected |
8 | 26 | Not detected | Not detected | Not detected |
9 | 28 | Detected | Detected | Detected |
10 | 9 | Detected | Detected | Detected |
11 | 8 | Detected | Detected | Detected |
12b | NAa | Detected | Not detected | Not detected |
13 | 16 | Not detected | Not detected | Not detected |
14 | 14 | Not detected | Not detected | Not detected |
15 | NAa | Not detected | Not detected | Not detected |
16 | 10 | Not detected | Not detected | Not detected |
17 | 37 | Not detected | Not detected | Not detected |
18 | 24 | Not detected | Not detected | Not detected |
19 | NAa | Detected | Detected | Detected |
20 | 16 | Not detected | Not detected | Not detected |
21 | 9 | Not detected | Not detected | Not detected |
22 | NAa | Not detected | Not detected | Not detected |
23 | 21 | Not detected | Not detected | Not detected |
24 | 15 | Not detected | Not detected | Not detected |
25 | 23 | Not detected | Not detected | Not detected |
26 | 10 | Detected | Detected | Detected |
27c | 4 | Detected | Detected | Detected |
28 | NAa | Not detected | Not detected | Not detected |
29 | 10 | Detected | Detected | Detected |
30 | NAa | Detected | Detected | Detected |
Abbreviation: NA, not applicable.
Symptom onset was not recorded in the electronic medical record for participants 7, 12, 15, 19, 22, 28, and 30.
Participant 12 presented with discordant results, with a positive result for the self-collected nasal sample but negative results from both physician-collected samples.
Participant 27 was asymptomatic but had been exposed to sudden acute respiratory syndrome coronavirus 2 by close contact 4 days before the study swab was obtained.