Table 3.
Secondary attack rates among high-risk and low-risk contacts in the Bavarian COVID-19 outbreak in January–February, 2020
| Number of contacts | Number of cases originating from these contacts | Secondary attack rate (95% CI) | ||
|---|---|---|---|---|
| High risk | ||||
| Household contacts | ||||
| Shared isolation in a hospital room | 4 | 3 | 75·0% (19·0–99·0) | |
| Together until isolation of case | 20 | 2 | 10·0% (1·2–32·0) | |
| Other close unprotected contact | 217 | 11 | 5·1% (2·6–8·9) | |
| Case–contact pairs* | 249 | 11 | 4·4% (2·2–7·8) | |
| Low risk | ||||
| Distant unprotected contact | 108 | 0 | 0·0% (0·0–3·4) | |
*
A case–contact pair is the connection between a given contact person and a potentially infectious case with contact time of at least 15 min. The number of case–contact pairs is higher than the number of contacts because a single contact person could have had contact with more than one case.