An Escherichia coli intestinal infectious disease that involves infection of the intestine caused by a serological subgroup of Escherichia coli called enterotoxigenic Escherichia coli (ETEC), which are non-invasive and produce heat-labile enterotoxin (LT) or heat stable toxin (ST). The bacteria colonize the GI tract by means of a fimbrial adhesin. The symptoms include diarrhea without fever.