Enteroaggregative Escherichia coli (EAEC), an increasingly recognized
cause of diarrhea in children in developing countries, has been partic
ularly associated with persistent diarrhea (more than 14 days), a majo
r cause of illness and death. Recent outbreaks implicate EAEC as a cau
se of foodborne illness in industrialized countries. The pathogenesis
of EAEC infection is not well understood, but a model can be proposed
in which EAEC adhere to the intestinal mucosa and elaborate enterotoxi
ns and cytotoxins, which result in secretory diarrhea and mucosal dama
ge. EAEC's ability to stimulate the release of inflammatory mediators
may also play a role in intestinal illness.