Below is the genetic fingerprinting analysis (PFGE patterns) of the E. coli O157:H7 samples that tested positive in humans involved in the Hartmann Dairy E. coli O157:H7 outbreak, as well as cows (though, according to Hartmann’statements, not cows that contributed milk to the batch linked to the outbreak), and environmental samples at the farm.

The Minnesota Department of Health, in connection with the Department of Agriculture’s investigation, has laid out the case against Hartmann Dairy in the outbreak, addressing pretty much relevant epidemiological question about the outbreak.