When diarrhea persists.
D003967:Diarrhea / Q000209:etiology* / Q000503:physiopathology / Q000628:therapy; D004761:Enterocolitis, Pseudomembranous / Q000150:complications; D004927:Escherichia coli Infections / Q000150:complications; D005873:Giardiasis / Q000150:complications; D006801:Humans; D007787:Lactose Intolerance / Q000150:complications