Figure. Fecal prevalence of Shiga-toxigenic (stx) Escherichia coli (STEC) O157:H7, stx-negative E. coli O157:H7, and stx-negative E. coli O157:non-H7 in 1,102 pens of pigs and 1,407 cattle (244 dairy cattle and 1,163 beef cattle) during exhibitions at 3 US state fairs and 29 county fairs, 2002. C, county; S, state. Data are presented in the order that fairs were sampled.
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