I think I ate some of that Topps meat, and feel sick. How is the illness diagnosed?
Infection with E. coli O157:H7 is diagnosed by detecting the bacterium in the stool. Most laboratories that culture stool do not test for E. coli O157:H7, so it is important to request that the stool specimen be tested on sorbitol-MacConkey (SMAC) agar for this organism. All people who suddenly have diarrhea with blood should get their stool tested for E. coli O157:H7.