Table 2. Incidence of hepatitis E virus RNA positive samples and estimated risk for nondetection, with 7-day window period risk for apheresis and whole blood donors. England, March 2016–December 2020.
| Donation type, year | Incidence, HEV RNA–positive samples/1 million donors | Risk per 1 million if window period 7 days (95% CI) |
|---|---|---|
| Apheresis | ||
| 2016 | 1,966.5 | 37.69 (24.15–56.07) |
| 2017 | 1,532.6 | 29.37 (17.94–45.36) |
| 2018 | 1,935.8 | 37.10 (23.77–55.20) |
| 2019 | 1,241.5 | 23.79 (13.32–39.24) |
| 2020 |
2,052.7 |
39.34 (25.21–58.53) |
| Whole blood | ||
| 2016 | 2,401.9 | 46.03 (39.45–53.40) |
| 2017 | 1,184.6 | 22.70 (20.03–25.63) |
| 2018 | 1,344.6 | 25.77 (23.14–28.61) |
| 2019 | 1,788.8 | 34.28 (31.21–37.58) |
| 2020 | 1,614.9 | 30.95 (27.91–34.23) |