Table 1.
IgG seropositivity to S and RBD in blood donors and pregnant women following virus emergence
| Weeks 2020–2021 | Bayesian estimate | S IgG (3SD) | RBD IgG (3SD) | S IgG (6SD) | RBD IgG (6SD) |
|---|---|---|---|---|---|
| 2020 | |||||
| 14: 30 March—5 April | 2.4 | 2.5 | 0.5 | 0.5 | 0.5 |
| Sampling gap | |||||
| 17: 20–27 April | 4.8 | 6.0 | 5.0 | 4.5 | 4.0 |
| 18: 27 April–3 May | 5.4 | 8.0 | 5.0 | 5.0 | 4.0 |
| 19: 4–10 May | 5.9 | 11.5 | 8.0 | 9.0 | 8.0 |
| 20: 11–17 May | 6.3 | 8.0 | 9.0 | 7.0 | 8.0 |
| 21: 18–24 May | 6.7 | 12.0 | 10.0 | 8.0 | 7.5 |
| 22: May 25–31 May | 7.0 | 4.5 | 3.5 | 4.0 | 3.5 |
| 23: 1–7 June | 7.3 | 10.5 | 9.0 | 9.5 | 7.0 |
| 24: 8–14 June | 7.8 | 8.0 | 8.0 | 6.5 | 7.0 |
| 25: 15–21 June | 8.3 | 8.5 | 7.0 | 7.5 | 7.0 |
| Sampling gap | |||||
| 30: 20–26 July | 11.4 | 22.0 | 20.5 | 17.0 | 14.5 |
| 31: 27 July–2 August | 11.9 | 14.5 | 13.5 | 10.5 | 9.0 |
| 32: 3–9 August | 12.3 | 18.0 | 16.0 | 13.5 | 10.5 |
| 33: 10–16 August | 12.5 | 15.5 | 12.5 | 12.5 | 10.0 |
| 34: 17–23 August | 12.7 | 20.0 | 20.0 | 16.5 | 9.5 |
| Sampling gap | |||||
| 45: 2–8 November | 14.1 | 15.5 | 14.0 | 12.5 | 11.0 |
| 46: 9–15 November | 14.2 | 21.0 | 17.0 | 16.5 | 13.5 |
| 47: 16–22 November | 14.3 | 17.5 | 16.0 | 17.0 | 12.0 |
| 48: 23–29 November | 14.5 | 20.5 | 18.0 | 16.0 | 12.5 |
| 49: 30 November–6 December | 14.7 | 16.5 | 14.5 | 12.5 | 12.0 |
| 50: 7–13 December | 14.8 | 20.0 | 17.5 | 18.0 | 15.5 |
| 2021 | Sampling gap | ||||
| 4: 25–31 January | 18.2 | 28.5 | 22.0 | 23.5 | 15.0 |
| 5: 1–7 February | 18.5 | 23.5 | 23.0 | 21.5 | 13.0 |
| 6: 8–14 February | 18.8 | 25.5 | 19.5 | 19.0 | 15.5 |
| 7: 15–21 February | 19.0 | 28.5 | 25.0 | 25.5 | 16.5 |
| 8: 22–28 February | 19.2 | 29.5 | 26.0 | 25.5 | 16.5 |