Volume 15, Number 1—January 2009
Research
Enhanced Hygiene Measures and Norovirus Transmission during an Outbreak
Janneke C.M. Heijne1
, Peter Teunis1, Gabriella Morroy, Clementine Wijkmans, Sandy Oostveen, Erwin Duizer, Mirjam Kretzschmar, and Jacco Wallinga
, Peter Teunis1, Gabriella Morroy, Clementine Wijkmans, Sandy Oostveen, Erwin Duizer, Mirjam Kretzschmar, and Jacco WallingaTable
New norovirus cases during outbreak at international scout jamboree, the Netherlands, starting on Jul 26, 2004 (day 0), by day of symptom onset and camp label
| Day of onset | Camp, no. new cases/d |
Total (n = 4,500) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| A (n = 485) | B (n = 721) | C (n = 729) | D (n = 499) | E (n = 735) | F (n = 825*) | G (n = 506) | Unknown | ||
| 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
| 1 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 2 | 4 |
| 2 | 0 | 2 | 2 | 1 | 1 | 3 | 0 | 1 | 10 |
| 3 | 2 | 7 | 9 | 0 | 2 | 1 | 0 | 1 | 22 |
| 4 | 3 | 4 | 2 | 1 | 2 | 2 | 4 | 0 | 18 |
| 5 | 0 | 10 | 1 | 2 | 1 | 1 | 2 | 2 | 19 |
| 6 | 0 | 12 | 3 | 2 | 2 | 0 | 0 | 1 | 20 |
| 7 | 2 | 19 | 14 | 2 | 3 | 3 | 6 | 3 | 52 |
| 8 | 3 | 5 | 8 | 2 | 2 | 1 | 1 | 0 | 22 |
| 9 | 7 | 10 | 14 | 0 | 2 | 10 | 24 | 2 | 69 |
| 10 | 5 | 4 | 3 | 2 | 0 | 16 | 8 | 11 | 49 |
| 11 | 3 | 2 | 4 | 1 | 0 | 1 | 1 | 3 | 15 |
| 12 | 4 | 1 | 4 | 2 | 1 | 1 | 0 | 2 | 15 |
| 13 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | 3 |
| 14 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 3 |
| 15 |
0 |
0 |
1 |
0 |
1 |
1 |
0 |
0 |
3 |
| Total† | 31 | 77 | 68 | 15 | 17 | 41 | 47 | 30 | 326 |
*This number is estimated.
†Overall attack rate: 7.2. Attack rate by camp: A, 6.4; B, 10.7; C, 9.3; D, 3.0; E, 2.3; F, 5.0; G, 9.3.
