Table 1 shows populations of E. coli O157:H7 in biofilms on stainless
steel, glass, plastic, and wooden coupon surfaces after treatment with
water, NaOCl (50 or 200 μg/ml), or ClO2 (50 or 200 μg/ml) for up to
15 min. Initial populations of E. coli O157:H7 in biofilms on these
food-contact surfaces were 8.4–9.5 log CFU/coupon.