From: A large waterborne outbreak of campylobacteriosis in Norway: The need to focus on distribution system safety
Tap water drinking from
Cases
Total exposed
AR %
RR (95% CI)
no tap water
0
5
/
RH only
10
27
37
Ref.
RL only
20
40
50
1.3 (0.7–2.4)
both zones
17
29
59
1.6 (0.9–2.8)