Table 3 Clinical characteristics of NoV and bacterial outbreaks. Catalonia, 15 October 2004 – 30 October 2005

No. outbreaks

30

86

No. cases

741

1018

Size of outbreak (median and range)

8.5 (2–174)

5.0 (2–123)

0.029^a

Attack rate (median)

0.66

0.70

0.091^a

Abdominal pain (%)

81.5

79.6

0.34 ^b

Vomiting (%)

59.0

39.0

< 0.001 ^b

Diarrhea (%)

68.5

87.0

< 0.001 ^b

Nausea (%)

62.2

41.2

< 0.001 ^b

Fever (%)

42.0

52.4

< 0.001 ^b

Hospitalizations (%)

0.15

8.6

< 0.001 ^b