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Unique PFGE patterns of Salmonella Typhimurium (sequence type 19) recovered at each sampling date from Michigan dairy farms in 2000 and 2009. Salmonella Typhimurium strains recovered in 2000 that were multidrug resistant and associated with human illnesses had a distinct PFGE pattern compared to the pansusceptible strain recovered in 2009, which was not associated with any reported human illnesses in Michigan between 2000 and 2012.
