Table 2.
SARS-CoV-2 polymerase chain reaction (PCR) and antibody [Luminex and point-of-care (POC)] test results at day 1 and day 28
| Total | Doctors | Nurses | Radiographers | Administrators | |
|---|---|---|---|---|---|
| Day 1 |
n = 434 |
n = 92 |
n = 253 |
n = 45 |
n = 44 |
| Positive PCR test | 0/434 | 0/92 | 0/253 | 0/45 | 0/44 |
| Positive Luminex antibody test | 80/434 (18.4%) | 16/92 (17.4%) | 54/253 (21.3%) | 4/45 (8.9%) | 6/44 (13.6%) |
| Seropositive for antibodies to both N and S antigens | 38/80 (47.5%) | 8/16 (50%) | 28/54 (51.9%) | 0/4 | 2/6 (33.3%) |
| Seropositive for antibodies to only N antigen | 32/80 (40%) | 7/16 (43.8%) | 18/54 (33.3%) | 3/4 (75%) | 4/6 (66.7%) |
| Seropositive for antibodies to only S antigen | 10/80 (12.5%) | 1/16 (6.3%) | 8/54 (14.8%) | 1/4 (25%) | 0/6 |
| Seropositive after pre-study positive PCR | 6/6 (100%) | 3/3 (100%) | 3/3 (100%) | NA | NA |
| Seropositive, previously symptomatic | 30/114 (26.3%) | 9/31 (29%) | 19/65 (29.2%) | 0/8 (0%) | 2/10 (20%) |
| Seropositive, previously asymptomatic | 50/320 (15.6%) | 7/61 (11.5%) | 35/188 (18.6%) | 4/37 (10.8%) | 4/34 (11.7%) |
| Seropositive, previously asymptomatic with possible household contact | 12/47 (25.5%) | 2/11 (18.2%) | 10/27 (37%) | 0/3 (0%) | 0/6 (0%) |
| Seropositive, with chronic underlying health condition | 18/103 (17.5%) | 4/15 (26.7%) | 12/60 (20%) | 2/14 (14.3%) | 0/14 (0%) |
| Seropositive, smokers | 9/37 (24.3%) | 1/2 (50%) | 6/22 (27.3%) | 0/2 (0%) | 2/11 (18.2%) |
| Positive POC test |
34/434 (7.8%) |
8/92 (8.7%) |
22/253 (8.7%) |
0/45 |
4/44 (9.1%) |
| Day 28 |
n = 400 |
n = 82 |
n = 237 |
n = 38 |
n = 43 |
| Positive PCR test | 0/400 | 0/82 | 0/237 | 0/38 | 0/43 |
| Positive Luminex antibody test | 53/400 (13.3%) | 9/82 (10.9%) | 39/237 (16.5%) | 1/38 (2.6%) | 4/43 (9.3%) |
| Seropositive for antibodies to both N and S antigens | 34/53 (64.2%) | 7/9 (77.8%) | 25/39 (64.1%) | 0/1 (0%) | 2/4 (50%) |
| Seropositive for antibodies to only N antigen | 9/53 (16.9%) | 0/9 (0%) | 7/39 (17.9%) | 0/1 (0%) | 2/4 (50%) |
| Seropositive for antibodies to only S antigen | 10/53 (18.9%) | 2/9 (22.2%) | 7/39 (17.9%) | 1/1 (100%) | 0/4 (0%) |
| Seropositive on days 1 and 28 | 49/53 (92.5%) | 9/9 (100%) | 35/39 (89.7%) | 1/1 (100%) | 4/4 (100%) |
| Seronegative on day 1, seropositive on day 28 | 4/53 (7.5%) | 0/9 (0%) | 4/39 (10.3%) | 0/1 (0%) | 0/4 (0%) |
| Seropositive on day 1, seronegative on day 28 | 26/80 (32.5%) | 5/16 (29.4%) | 17/54 (31.2%) | 2/4 (50%) | 2/6 (33.3%) |
| Positive POC antibody test | 29/400 (7.3%) | 5/82 (6.1%) | 22/237 (9.3%) | 0/38 (0%) | 2/43 (4.7%) |