Table 1

Dates of visit, attack rates and laboratory-confirmed cases by groups, hotel X, Norway, March 2007

Group

Dates of visit

Response rate %

Attack rate %

Number of laboratory-
confirmed cases

Group A
12–16
65 (11/17)
0 (0/11)
0
Group B
15–16
38 (17/45)
12 (2/17)
0
Group C
16–18
75 (33/44)
67 (22*/33)
9
Group D
16–18
71 (10/14)
10 (1/10)
1
Group E
20–22
58 (7/12)
0 (0/7)
0
Group F
21–22
40 (4/10)
0 (0/4)
0
Group G
21–23
44 (7/16)
0 (0/7)
0

Total

56 (89/158)
28 (25/89)
10

* Of these 22, 14 were Swedish

Hajdu et al. BMC Infectious Diseases 2008 8:152   doi:10.1186/1471-2334-8-152