Table 2.
Group‐specific attack rates and risk factors for confirmed SARS‐CoV‐2 infection among close contacts of SDHB cases.
| All |
Last contact with infector pre‐lockdown (before March 26) |
Last contact with infector during lockdown (after March 25) |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| Number of contacts | Number of secondary cases | Secondary attack rate, 95%CI | Number of contacts | Number of secondary cases | Secondary attack rate, 95%CI | Number of contacts | Number of secondary cases | Secondary attack rate, 95%CI | |
| Total | 1,060 | 55 | 5·2% (3·9–6·7) | 768/1060 | 24 | 3·1% (2·0–4·6) | 292/1060 | 31 | 10·6% (7·3–14·7) |
| Exposure setting | |||||||||
| Household | 277/1049 | 36 | 13·0% (9·3–17·5) | 101/766 | 9 | 8·9% (4·2–16·2) | 176/283 | 27 | 15·3% (10·4–21·5) |
| Non‐household | 771/1049 | 19 | 2·5% (1·5–3·8) | 665/766 | 15 | 2·3% (1·3–3·7) | 107/283 | 4 | 3·7% (1·0–9·3) |
| Age group, years | |||||||||
| <1 | 9/987 | 0 | 0·0% (0·0–33·6*) | 6/715 | 0 | 0·0% (0·0–45·9*) | 3/272 | 0 | 0·0% (0·0–70·8*) |
| 1–4 | 4/987 | 0 | 0·0% (0·0–60·2*) | 3/715 | 0 | 0·0% (0·0–70·8*) | 1/272 | 0 | 0·0% (0·0–97·5*) |
| 5–14 | 60/987 | 1 | 1·7% (0·0–8·9) | 38/715 | 1 | 2·6% (0·1–13·8) | 22/272 | 0 | 0·0% (0·0–15·4*) |
| 15–24 | 222/987 | 11 | 5·0% (2·5–8·7) | 156/715 | 2 | 1·3% (0·2–4·6) | 66/272 | 9 | 13·6% (6·4–24·3) |
| 25–44 | 317/987 | 22 | 6·9% (4·4–10·3) | 227/715 | 8 | 3·5% (1·5–6·8) | 90/272 | 14 | 15·6% (8·8–24·7) |
| 45–64 | 310/987 | 18 | 5·8% (3·5–9·0) | 254/715 | 11 | 4·3% (2·2–7·6) | 56/272 | 7 | 12·5% (5·2–24·1) |
| >64 | 65/987 | 2 | 3.1% (0·3–10·7) | 31/715 | 2 | 6·5% (0·8–21·4) | 34/272 | 0 | 0·0% (0·0–10·3*) |
| Sex | |||||||||
| Female | 522/1033 | 33 | 6·3% (4·4–8·8) | 378/754 | 14 | 3·7% (2·0–6·1) | 144/279 | 19 | 13·2% (8·1–19·8) |
| Male | 511/1033 | 21 | 4·1% (2·6–6·2) | 376/754 | 10 | 2·7% (1·3–4·8) | 135/279 | 11 | 8·1% (4·1–14·1) |
Note:
*
One‐sided, 97.5% confidence interval. Lower denominations indicate missing data, excluded from the analysis. Percentages might not total 100% because of rounding. Secondary cases include close contacts of SDHB cases who reside in other geographical areas. COVID‐19: Coronavirus disease 2019.