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Seven children in a third-grade class developed bloody diarrhea; one of them was hospitalized with renal failure. Stool cultures for Gram-positive and Gram-negative bacteria (including Campylobacter) yielded only “normal intestinal flora” and “lactose-positive organisms” on MacConkey agar. Epidemiologists found that, three days before the outbreak, the class had gone to a local restaurant for a party. All children who became ill, and none who did not, had eaten hamburgers. Later it was found that some lactose fermenters failed to ferment sorbitol. Which organism is most strongly suggested by the laboratory and epidemiologic data?
A. Bacillus cereus
B. Campylobacter jejuni
C. Clostridium perfringens
D. Escherichia coli
E. Listeria monocytogenes
in Microbiology by

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D. Escherichia coli