TABLE 4.
Estimate of Additional COVID-19 Cases Resulting from Students and Staff Remaining in School via TTS
| Variable | 11/29/2021–1/28/2022 (Delta and Omicron) | 1/3/2022–1/28/2022 (Omicron) |
|---|---|---|
| Analysis-eligible population (A) | 1675 | 940 |
| Total tertiary contacts reported (B) | 667 | 435 |
| Total tertiary contacts enrolled in TTS (C) | 192 | 109 |
| Positive tertiary contacts enrolled in TTS (D) | 20 | 7 |
| Risk calculation | ||
| Proportion of tertiary contacts who enroll in TTS (E = C/B) | 0.29 | 0.25 |
| Estimate of total positive tertiary contacts (F = D×(1/E)) | 68.97 | 28 |
| Estimate of positivity rate (transmission)a (G = [F/(A-C)] ×100), % | 4.7 (CI: 1.7–13.1) | 3.4 (CI: 0.7–15.2) |
| Number of additional cases per 100 TTS participants | ∼5 | ∼4 |
| Close contacts remaining in school to generate 1 additional case | 21 | 29 |
a
To calculate rate, tertiary contacts enrolled in TTS were subtracted from analysis-eligible population in the denominator.