Table 2.

Calculated median risk of infection (± 90% CI) with pathogenic E. coli due to one-time, daily, and yearly exposure to the contact surfaces within the CABs

	Cistern handle	Toilet seat	Floor surface in front of toilet	Internal pull latch	External door handle	Tap handle in shower cubicle	Internal common floor surface	Tap handle in wash basin
One time	1.9 × 10−2 (± 7.1 × 10−4)	1.1 × 10−2 (± 1.4 × 10−4)	3.6 × 10−3 (± 1.5 × 10−3)	2.5 × 10−2 (± 3.0 × 10−4)	1.6 × 10−2 (± 1.9 × 10−3)	2.1 × 10−2 (± 2.1 × 10−3)	9.4 × 10−3 (± 1.8 × 10−3)	1.8 × 10−2 (± 2.0 × 10−3)
Daily risks	2.7 × 10−2 (± 1.0 × 10−3)	1.6 × 10−2 (± 2.2 × 10−4)	5.4 × 10−3 (± 1.9 × 10−3)	3.6 × 10−2 (± 4.7 × 10−4)	2.4 × 10−2 (± 2.6 × 10−3)	3.1 × 10−2 (± 2.7 × 10−3)	1.4 × 10−2 (± 2.4 × 10−3)	2.7 × 10−2 (± 2.6 × 10−3)
Yearly risks	1 (± 5.2 × 10−3)	9.9 × 10−1 (± 7.3 × 10−3)	8.6 × 10−1 (± 6.1 × 10−3)	1 (± 4.8 × 10−4)	9.9 × 10−1 (± 3.1 × 10−3)	1 (± 3.8 × 10−3)	9.9 × 10−1 (± 5.4 × 10−3)	9.9 × 10−1 (± 1.8 × 10−3)