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Number of household contacts, number of household secondary infected persons, and household secondary attack rates for the five SARS-CoV-2strains.
| SARS-CoV-2 strain | Original strain | Delta B.1.617.2 | BA.2 | BA.5.2 | BF.7 |
|---|---|---|---|---|---|
| Number of household contacts | 216 | 234 | 119 | 147 | 29 |
| Number of household secondary infected persons | 55 | 64 | 51 | 78 | 12 |
| Household secondary attack rates [% (95% CI)] | 25.5 (20.1–31.7) | 27.4 (22.0–33.4) | 42.9 (34.3–51.8) | 53.1 (45.0–60.9) | 41.4 (25.5–59.3) |
