This document discusses diarrhea caused by various pathogens including bacteria like E. coli. It describes 5 virulence groups of E. coli that can cause diarrhea: enteroaggregative E. coli (EAEC), enterohemorrhagic E. coli (EHEC), enteroinvasive E. coli (EIEC), enteropathogenic E. coli (EPEC), and enterotoxigenic E. coli (ETEC). Signs and symptoms of diarrhea include loose stools, loss of appetite, abdominal cramps, nausea, and possibly fever. Prevention methods include hand washing, proper food handling, pasteurization, sanitation, and safe water supplies. Treatment focuses on fluid replacement and medication in