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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