Table 1.
Demographic and baseline characteristics of index patients and household contacts
| Variable | n/N (%) |
|---|---|
| Index patients (n = 108) | |
| Age‐group | |
| 0–4 | 9/108 (8·3) |
| 5–13 | 57/108 (52·8) |
| 14–34 | 25/108 (23·1) |
| 35–49 | 8/108 (7·4) |
| ≥50 | 9/108 (8·3) |
| Sex (male) | 54/108 (50·0) |
| Chronic underlying disease | 25/107 (23·4) |
| Smoker | 11/102 (10·8) |
| Vaccinated against pandemic influenza | 1/108 (0·9) |
| Antiviral treatment | 25/106 (23·6) |
| Household size | |
| 2–3 | 53/108 (49·1) |
| ≥4 | 55/108 (50·9) |
| Household contacts (n = 267) | |
| Age‐group | |
| 0–4 | 18/258 (6·6) |
| 5–13 | 47/258 (17·8) |
| 14–34 | 56/258 (21·7) |
| 35–49 | 115/258 (44·6) |
| ≥50 | 24/258 (9·3) |
| Sex (male) | 129/267 (48·3) |
| Chronic underlying disease | 40/266 (15·0) |
| Smoker | 66/260 (25·4) |
| Vaccinated against pandemic influenza | 29/267 (10·9) |
| Relationship to index patient | |
| Father | 73/261 (28·0) |
| Mother | 83/261 (31·8) |
| Sibling | 67/261 (25·7) |
| Other | 38/261 (14·6) |