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Table 1 Dates of visit, attack rates and laboratory-confirmed cases by groups, hotel X, Norway, March 2007

From: Investigation of Swedish cases reveals an outbreak of cryptosporidiosis at a Norwegian hotel with possible links to in-house water systems

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
  1. * Of these 22, 14 were Swedish