Table 1. Characteristics and serostatus of recruited participants who had a valid baseline result.
| Recruited
with an initial valid serostatus |
Seropositive
at V1 (%) |
Asymptomatic
(% of seropositive at V1) |
Completed
both V1 and V2 (% of recruited) |
Seroincident
cases (% of seronegative at V1) |
|
|---|---|---|---|---|---|
| Total | 1275 | 311 (24·4) | 122 (39·2) | 1166 (87·5) | 16 (1·7%) |
| Job location | |||||
| Emergency
Department (ED) |
103 | 26 (25·2) | 13 (50·0) | 90 (87·4) | 1 (1·2) |
| Acute Medical Unit
(AMU) |
83 | 38 (45·8) | 17 (44·4) | 66 (79·5) | 0 (0·0) |
| Critical Care | 100 | 18 (18·0) | 7 (38·9) | 95 (95·0) | 0 (0·0) |
| Geriatric Care | 23 | 3 (13·0) | 1 (33·3) | 22 (95·7) | 1 (5·0) |
| Infectious Disease
Ward |
139 | 26 (18·7) | 11 (42·3) | 121 (87·1) | 7 (6·2) |
| Other | 664 | 157 (23·6) | 56 (35·7) | 621 (93·5) | 2 (0·3) |
| Respiratory Geriatric
Ward |
92 | 27 (29·3) | 10 (37·0) | 85 (92·4) | 2 (3·1) |
| Respiratory Ward | 58 | 13 (22·4) | 5 (38·5) | 54 (93·1) | 2 (4·4) |
| Job role | |||||
| Admin | 127 | 26 (20·5) | 12 (46·2) | 118 (92·9) | 1 (0·9) |
| Allied medical 1 | 38 | 0 (0·0) | — | 37 (97·4) | 0 (0·0) |
| Domestic services | 136 | 39 (28·7) | 24 (61·5) | 127 (93·4) | 4 (4·1) |
| Healthcare
assistants |
163 | 39 (23·9) | 21 (53·8) | 140 (85·9) | 3 (2·4) |
| Doctors | 232 | 52 (22·4) | 18 (34·6) | 211 (90·9) | 0 (0·0) |
| Nurses | 433 | 116 (26·7) | 34 (29·3) | 391 (90·3) | 7 (2·2) |
| Other | 31 | 5 (16·1) | 2 (40·0) | 29 (93·5) | 0 (0·0) |
| Pharmacists | 35 | 8 (22·8) | 5 (62·5) | 33 (94·3) | 1 (3·7) |
| Occupational and
physiotherapists |
33 | 15 (45·5) | 3 (20·0) | 33 (100·0) | 0 (0·0) |
| Radiographers | 42 | 9 (21·4) | 2 (22·2) | 42 (100·0) | 0 (0·0) |
| COVID-19 zone 2 | |||||
| 1 (lowest COVID-19
contact) |
104 | 22 (21·2) | 10 (54·5) | 96 (92·3) | 1 (1·2) |
| 2 | 248 | 50 (20·2) | 27 (46·0) | 232 (93·5) | 0 (0·0) |
| 3 | 41 | 7 (17·1) | 6 (14·3) | 39 (95·1) | 1 (2·9) |
| 4 | 153 | 35 (22·9) | 24 (31·4) | 142 (92·8) | 1 (0·8) |
| 5 | 305 | 69 (22·6) | 46 (33·3) | 280 (91·8) | 3 (1·3) |
| 6 (highest COVID-19
contact) |
423 | 128 (30·3) | 76 (40·6) | 376 (88·9) | 10 (3·4) |
| Age (years) | |||||
| <30 | 267 | 67 (25·1) | 32 (47·8) | 236 (88·4) | 6 (3·0) |
| 30–39 | 306 | 69 (22·5) | 22 (31·8) | 279 (91·2) | 5 (2·1) |
| 40–49 | 314 | 72 (22·9) | 29 (40·2) | 293 (93·3) | 2 (0·8) |
| 50–59 | 314 | 76 (24·2) | 28 (36·8) | 288 (91·7) | 1 (0·4) |
| 60+ | 74 | 27 (36·5) | 11 (40·7) | 70 (94·6) | 2 (4·3) |
| Ethnicity | |||||
| White | 1130 | 281 (24·9) | 108 (38·4) | 1035 (91·6) | 15 (1·8) |
| Black/Black British | 33 | 6 (18·2) | 3 (50·0) | 30 (90·9) | 0 (0·0) |
| Asian/Asian British | 76 | 17 (22·4) | 7 (41·2) | 70 (92·1) | 1 (1·7) |
| Other | 33 | 7 (21·2) | 4 (57·1) | 30 (90·9) | 0 (0·0) |
| Gender 3 | |||||
| Female | 1008 | 253 (24·1) | 105 (41·5) | 922 (91·5) | 14 (1·9) |
| Male | 265 | 58 (21·9) | 17 (29·3) | 242 (91·3) | 2 (0·9) |
1Allied Medical includes Speech and Language Therapists, Cardiac Physiologists, Dental Hygienists, Dietitians, ECG technicians, Orthotists, Podiatrists, Rehabilitation assistants
2COVID-19 Zones are defined in extended data 24 .
3Participants were able to define their gender as non-binary, transgender or could choose not to disclose