Table 2.
Secondary household transmission rate and incidence of gastroenteritis in each age group and family members (n = 711)
| No. of family members | No. of infected cases | Secondary household transmission rate* (%) | No. of cases with gastroenteritis | Incidence of gastroenteritis* (%) |
|
|---|---|---|---|---|---|
| Age group (years) | |||||
| 0–5 | 39 | 6 | 15·4 | 3 | 7·7 |
| 6–9 | 74 | 17 | 23·0 | 4 | 5·4 |
| 10–19 | 37 | 4 | 10·8 | 2 | 5·4 |
| 20–29 | 79 | 8 | 10·1 | 2 | 2·5 |
| 30–39 | 270 | 23 | 8·5 | 0 | 0·0 |
| 40–49 | 63 | 7 | 11·1 | 1 | 1·6 |
| 50–59 | 58 | 1 | 1·7 | 0 | 0·0 |
| ⩾60 | 91 | 3 | 3·3 | 0 | 0·0 |
| Family members | |||||
| Father | 178 | 8 | 4·5 | 1 | 0·6 |
| Mother | 201 | 20 | 10·0 | 2 | 1·0 |
| Brother | 61 | 13 | 21·3 | 4 | 6·6 |
| Sister | 71 | 13 | 18·3 | 5 | 7·0 |
| Grandfather | 59 | 1 | 1·7 | 0 | 0·0 |
| Grandmother | 90 | 1 | 1·1 | 0 | 0·0 |
| Other family member | 51 | 13 | 14·8 | 0 | 0·0 |
| Total | 711 | 69 | 9·7 | 12 | 1·7 |
* Trend in age groups from 0–5 until ⩾60 years (P < 0·001).