Table 2. Incidence of SARS-CoV-2–Positive and SARS-CoV-2–Negative Respiratory Illness Episodes by Age Group.
| Age group, y | Follow-up time, wk | Confirmed SARS-CoV-2 positive | Confirmed SARS-CoV-2 positive or probable | SARS-CoV-2 negative | |||
|---|---|---|---|---|---|---|---|
| Episodes, No. | Incidence/PY (95% CI)a | Episodes, No. | Incidence/PY (95% CI)a | Episodes, No. | Incidence/PY (95% CI)a | ||
| <12 | 8985 | 37 | 0.22 (0.16-0.29) | 69 | 0.40 (0.33-0.48) | 162 | 0.94 (0.89-0.97) |
| 12-17 | 3965 | 16 | 0.21 (0.13-0.32) | 24 | 0.30 (0.21-0.42) | 19 | 0.25 (0.16-0.37) |
| ≥18 | 13 933 | 72 | 0.27 (0.22-0.33) | 91 | 0.34 (0.29-0.40) | 155 | 0.58 (0.52-0.64) |
| All | 26 883 | 123 | 0.24 (0.21-0.28) | 183 | 0.36 (0.31-0.40) | 329 | 0.65 (0.61-0.69) |
Abbreviation: PY, person-year.
a
Incidence rates were based on household outbreaks occurring during the core study period.