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Table 1 Attack rate of giardiasis by water supply zone, Bergen municipality Aug-Nov 2004 (n = 795)

From: A large community outbreak of waterborne giardiasis- delayed detection in a non-endemic urban area

Watersupply Cases Number of recipents Attack-rate (per 10,000)   
A 637 42,774 148.9   
B 15 9,685 15.5   
C 89 105,440 8.4   
D 33 34,406 9.6   
E 4 14,266 2.8   
F 13 23,848 5.5   
     Risk ratio 95% confidence interval
B+C+D+E+F 158 194,519 8.1 Ref.  
A 637 42,774 148.9 18.3 15.4 – 21.8