ver·o·tox·in (verґo-tok″sin) [Vero cells, q.v.] either of two enterotoxins, designated I and II, elaborated by certain enterohemorrhagic serovars of Escherichia coli; both are cytotoxic to intestinal villi and colonic epithelial cells and v. I is also cytotoxic to vascular endothelial cells. They are similar to toxins of Shigella dysenteriae and have been implicated in at least some cases of hemorrhagic colitis and enterocolitis.

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