Table 2.
Attributes of exposures between index cases and their close contacts (N = 365)
| Exposure attribute | N (%) |
|---|---|
| Symptomatic status of index case on day of exposure (N = 365) | |
| Asymptomatic | 76 (20.8) |
| Pre-symptomatic | 115 (31.5) |
| Symptom onset | 51 (14.0) |
| Post symptom onset | 123 (33.7) |
| Case coughing at exposure | |
| Yes | 57 (15.6) |
| No | 308 (84.4) |
| Case had congestion or runny nose at exposure | |
| Yes | 115 (31.5) |
| No | 250 (68.5) |
| Viral load of index case at time of test, log10 copies per mL (N = 365) | |
| < 5 | 134 (36.7) |
| 5–8 | 219 (60.0) |
| > 8 | 12 (3.3) |
| Location (N = 365) | |
| Indoor | 330 (90.4) |
| Outdoor | 35 (9.6) |
| Duration (N = 349) | |
| < 30 min | 35 (10.0) |
| ≥ 30 min | 314 (90.0) |
| Mask use (N = 363) | |
| No masks used | 300 (82.6) |
| Case and/or contact wore a mask | 63 (17.4) |
| Contact type (N = 362) | |
| Physical contact | 48 (13.3) |
| Non-physical contact | 314 (86.7) |
| Contact relationship (N = 365) | |
| Household | 149 (40.8) |
| Non-household | 216 (59.2) |