0.1% peptone water and surface plated on
tryptic soy agar (TSA; BD/Difco), MacConkey sorbitol (BD/Difco)
agar containing nalidixic acid (50 mg/ml) (MSAN), and dichloran
rose bengal chloramphenicol (DRBC; BD/Difco) agar to determine
populations of TAB, E. coli O157:H7, and MY, respectively