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Inactivation of E. coli O157:H7 strains 43895-EPS (○), ATCC 43895- (□), and ATCC 43895+ (▵) in biofilms formed in minimal salt broth at 12°C upon treatment with 0, 50, and 200 μg of chlorine/ml. The detection limit per coupon (dotted line) is 2.5 log10 CFU. Bars indicate standard deviations.
