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E. coli O157:H7 shed by inoculated donor pigs and naïve pigs exposed to those donors. Day 0 is the day that infected donors were moved into a different room and penned with a naïve pig. •, donor pigs shedding ≥104 CFU/g; ○, donor pigs shedding <104 CFU/g; ♦, naïve pigs exposed to donors shedding ≥104 CFU/g; ⋄, naïve pigs exposed to donors shedding <104 CFU/g. Values below the dotted line were positive by enrichment culture only (<50 CFU/g).
