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Many strains of Escherichia coli O157:H7 produce, under stress, an exopolysaccharide (EPS) comprised of colanic acid (CA) and form mucoid colonies on minimal glucose agar (MGA) at ambient temperature. Previous research conducted in our laboratory involving a CA-proficient (W6-13) and a CA-deficient (M4020; wcaD Ekan r ) strain of E. coli O157:H7 revealed that CA conferred acid and heat tolerance...
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