Table 5. Estimated populations exposed to SARS-CoV-2 and ratios of peak seroprevalence to cumulative incidence during last survey month.
| Chadiza | Chipata | Chongwe | Lusaka | |
|---|---|---|---|---|
| Peak SARS-CoV-2 seroprevalence† | 77.2% | 97.3% | 96.8% | 100.0% |
| 2022 census population | 111,069 | 327,059 | 313,389 | 2,204,059 |
| Reported COVID-19 cases | 2,761 | 8,096 | 3,303 | 75,990 |
| Cumulative incidence‡ | 2.5% | 2.5% | 1.1% | 3.4% |
| Estimated population with evidence of SARS-CoV-2 exposure§ | 85,745 | 318,228 | 303,361 | 2,204,059 |
| Ratio of seroprevalence to cumulative incidence | 31:1 | 39:1 | 92:1 | 29:1 |
†Peak SARS-CoV-2 seroprevalence for Chadiza District was April 2022; for Chipata District, peak was August 2022; for Chongwe district, peak was August 2022; for Lusaka District, peak was September 2022.
‡Calculated as reported cases divided by population projection.
§Calculated as seroprevalence multiplied by population projection. 2022 census data were obtained from the Zambia Statistics Agency and reported COVID-19 cases were obtained from the Zambia National Public Health Institute.