title: Are humans a source of Escherichia coli O157:H7, the agent of hemorrhagic colitis?
mesh_terms: D000293:Adolescent; D000328:Adult; D003092:Colitis / Q000382:microbiology*; D004197:Disease Reservoirs; D004927:Escherichia coli Infections / Q000635:transmission*; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000150:complications; D006801:Humans; D007223:Infant; D008875:Middle Aged