The invasive types of E. coli are called enterohemorrhagic E. coli (EHEC), and enteroinvasive E. coli, (EIEC).
Bloody diarrhea, sometimes called dysentery, is produced by EHEC, EIEC, some types of Salmonella, some types of Shigella, and Yersinia.
ETEC, EPEC, and EIEC are unusual in the United States and can usually be identified only by specialists in research laboratories.
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