Table 2:
Seroprevalence at collection time points overall and by SARS-CoV-2 infection confirmed by polymerase chain reaction testing
| Serology status | Prior PCR status, no. | Total no. (%) of samples positive and negative at each time point | |
|---|---|---|---|
| Positive | Negative | ||
| Positive | |||
| Baseline | 30/40 | 18/1022 | 48/1062 (4.5) |
| 6 weeks | 30/39 | 21/1003 | 51/1042 (4.9) |
| 12 weeks | 29/38 | 19/928 | 48/966 (6.0) |
| At any point | 31/40 | 26/1022 | 57/1062 (5.4) |
| Negative | |||
| Baseline | 10/40 | 1004/1022 | 1014/1062 (95.5) |
| 6 weeks | 9/39 | 982/1003 | 991/1042 (95.1) |
| 12 weeks | 9/38 | 909/928 | 918/966 (95.0) |
| At any point | 9/40 | 996/1022 | 1005/1062 (94.6) |
| Total | 40 | 1022 | 1062 |
Note: PCR = polymerase chain reaction.