Table 2.
Distribution of participants according to their clinical history, Blood Donors Services, Cameroon, 2021
| Survey 1 | Survey 2 | Survey 3 | Pooled surveys | p value | |
|---|---|---|---|---|---|
| Total | N = 743 | N = 1202 | N = 1501 | N = 3446 | |
| Comorbidities | % (n) | % (n) | % (n) | % (n) | < 0.001 |
| None | 97.7 (726) | 99.4 (1195) | 99.2 (1489) | 99.0 (3410) | |
| One or more | 2.3 (17) | 0.6 (7) | 0.8 (12) | 1.0 (36) | |
| Symptoms | < 0.001 | ||||
| None | 65.8 (489) | 81.9 (984) | 77.2 (1159) | 76.4 (2632) | |
| One or more | 34.2 (254) | 18.1 (218) | 22.8 (342) | 23.6 (814) | |
| Previous contact with a COVID-19 case | 0.14 | ||||
| Yes | 0.8 (6) | 1.8 (21) | 1.1 (16) | 1.3 (43) | |
| No/Do not know | 99.2 (737) | 98.3 (1181) | 98.9 (1485) | 98.8 (3403) | |
| COVID-19 vaccination | * | * | 1.7 (25) | 0.7 (25) | < 0.001 |
| Type of vaccination | 0.9 | ||||
| AstraZeneca | * | * | 32.0 (8) | 32.0 (8) | |
| Johnson&Johnson | * | * | 44.0 (11) | 44.0 (11) | |
| PFIZER | * | * | 4.0 (1) | 4.0 (1) | |
| SINOPHARM | * | 20.0 (5) | 20.0 (5) | ||
| Previously PCR COVID-19 tested | < 0.001 | ||||
| Yes | 12.8 (95) | 12.8 (154) | 8.5 (128) | 10.9 (377) | |
| No | 87.2 (648) | 87.2 (1048) | 91.5 (1373) | 89.1 (3069) | |
| Number of previous PCR COVID-19 test realized | 0.009 | ||||
| None | 87.2 (648) | 87.2 (1048) | 91.5 (1373) | 89.1 (3069) | |
| Once | 7.7 (57) | 8.2 (99) | 5.6 (84) | 7.0 (240) | |
| Twice | 3.2 (24) | 2.7 (33) | 1.9 (29) | 2.5 (86) | |
| Thrice + | 1.9 (14) | 1.8 (22) | 1.0 (15) | 1.5 (51) | |
| Outcome of previous test | 0.14 | ||||
| Negative | 98.9 (94) | 95.4 (144) | 93.9 (123) | 95.8 (361) | |
| Positive | 1.1 (1) | 4.6 (7) | 6.1 (8) | 4.2 (16) |
*There was no vaccination at surveys 1 and 2