Table 2 Attributes of exposures between index cases and their close contacts (N = 365)
From: SARS-CoV-2 viral load is associated with risk of transmission to household and community contacts
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) |