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Table 2 Attack rates (AR) by tap water drinking exposures among 101 randomly selected household members from Røros

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 0 /
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)
  1. RH: higher zone, RL: lower zone of Røros waterworks