Volume 8, Number 6—June 2002
Research
Waterborne Outbreak of Norwalk-Like Virus Gastroenteritis at a Tourist Resort, Italy
Della Boccia*
, Alberto Eugenio Tozzi*, Benvon Cotter*§, Caterina Rizzo†, Teresa Russo‡, Gabriele Buttinelli*, Alfredo Caprioli*, Maria Luisa Marziano*, and Franco Maria Ruggeri*
, Alberto Eugenio Tozzi*, Benvon Cotter*§, Caterina Rizzo†, Teresa Russo‡, Gabriele Buttinelli*, Alfredo Caprioli*, Maria Luisa Marziano*, and Franco Maria Ruggeri*
Table 3
Attack rates and relative risks according to usual behaviors and activities of staff members, tourist resort, Italy, July 2000
| Exposure | No. (n=69) | No. exposed | Attack rate (%) | Relative risk | 95% CI a |
|---|---|---|---|---|---|
| Shower on the beach | 22 | 14 | 63.6 | 1.8 | 1.2–2.6 |
| Swimming in the pool | 45 | 22 | 48.9 | 1.4 | 0.9–2.0 |
| Drinking tap water | 104 | 47 | 45.2 | 1.4 | 0.9–2.2 |
| Drinks with ice | 128 | 55 | 43.0 | 1.8 | 1.0–3.2 |
| Swimming in the sea | 72 | 31 | 43.0 | 1.2 | 0.8–1.7 |
| Eating at resort restaurant | 159 | 64 | 40.2 | 1.5 | 0.5–3.9 |
| Eating ice cream | 140 | 56 | 40.0 | 1.1 | 0.6–1.9 |
| Eating meat | 151 | 60 | 39.7 | 1.2 | 0.6–2.4 |
| Eating salad | 123 | 48 | 39.0 | 1.0 | 0.6–1.6 |
| Eating fruit | 139 | 54 | 38.8 | 1.0 | 0.6–1.8 |
| Eating pasta | 142 | 55 | 38.7 | 1.2 | 0.6–2.1 |
| Consuming drinks on draught | 91 | 35 | 38.5 | 1.0 | 0.7–1.4 |
| Eating fish | 112 | 40 | 35.7 | 0.7 | 0.5–1.1 |
| Eating seafood | 85 | 28 | 32.9 | 0.7 | 0.5–1.1 |
aCI, confidence interval.
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