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apples (golden delicious) were purchased from a local store (anseongsi, korea). the surface of all apples you blemish - free and disinfected with 70% ethanol, then dried for inoculation. apples were left unblemished, were given 1.5 cm diameter bruises, or cut with a notch measuring 2.0 cm long and 0.5 cm deep using an alcohol - sterilized knife. culture cocktails (100 ml of e. coli o157: h7, s. typhimurium, or s. aureus suspension) were pipetted onto cut, bruised, or unblemished apple surfaces (each foodborne pathogen on a different fruit), and dried in a hood for 1e2 h
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