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Comparison of acid tolerance of E. coli strains at different pH in buffered peptone water. Acid tolerance of ESC818 – E. coli OUT (OgGp9):H18 isolated from milk samples, ESC828 – E. coli OUT (OgGp9):H18 isolated from patient faeces, EHEC O157:H7 – enterohemorrhagic E. coli derived from the foodborne outbreak, and K-12 – a model strain of E. coli (non-pathogenic) at pH 2.5, 3.0, 4.0, and 7.0 in buffered peptone water is shown. Error bars indicate standard deviation (n = 3).
