Participant baseline characteristics
| Characteristic | No. (%) of participants n = 1580* |
|---|---|
| Mode of saliva sampling | |
| Spit | 1042 (65.9) |
| Sponge | 538 (34.0) |
| Age, yr | |
| 3–5 | 326 (20.6) |
| 6–8 | 368 (23.3) |
| 9–11 | 375 (23.7) |
| 12–14 | 297 (18.8) |
| 15–17 | 214 (13.5) |
| Symptomatic | 1032 (65.3) |
| No. of symptoms among symptomatic participants, median (interquartile range) | 3 (2–4) |
| Positive exposure | 650 (41.1) |
| Travel within 14 d | 10 (0.6) |
↵* Unless indicated otherwise.