TABLE 2. Estimated number of SARS-CoV-2 infections based on seroprevalence estimates and the number of reported COVID-19 cases at of the end of the preceding month among persons aged <18 years — Mississippi, May 17–September 19, 2020.
| Specimen collection date | Estimated seroprevalence* % (95% CI) | Estimated cumulative infections,† no. (95% CI) | Cumulative reported cases§ (report date) | Estimated infection/reported case ratio (95% CI) |
|---|---|---|---|---|
| May 17–31 |
2.5 (0.9–5.3) |
17,461 (6,286–37,016) |
256 (Apr 30) |
68.2 (24.6–144.6) |
| Jun 1–30 |
5.2 (3.7–8.0) |
36,318 (25,842–55,874) |
1,083 (May 31) |
33.5 (23.9–51.6) |
| Jul 1–31 |
8.6 (6.4–12.4) |
60,064 (44,699–86,604) |
2,869 (Jun 30) |
20.9 (15.6–30.2) |
| Aug 1–31 |
13.0 (10.3–17.6) |
90,795 (71,937–122,922) |
6,439 (Jul 31) |
14.1 (11.2–19.1) |
| Sep 1–19 | 16.3 (12.9–22.0) | 113,842 (90,096–153,652) | 8,993 (Aug 31) | 12.7 (10.0–17.1) |
Abbreviation: CI = confidence interval.
* Standardized to the race/ethnicity distribution of the Mississippi population aged <18 years using weights derived from the 2019 U.S. Census; 95% CIs were calculated for race/ethnicity–weighted SARS-CoV-2 seropositivity in the sample accounting for assay test performance.
† Race/ethnicity–standardized seroprevalence estimates for each period applied to the 2019 Mississippi population aged <18 years = 698,420 (https://www.census.gov).
§ Cumulative number of confirmed and probable COVID-19 cases in persons aged <18 years reported to Mississippi State Department of Health as of the end of the preceding month.