Giardiasis.
D001706:Biopsy; D003967:Diarrhea / Q000209:etiology*; D004198:Disease Susceptibility; D004386:Duodenum / Q000469:parasitology / Q000473:pathology; D005243:Feces / Q000032:analysis; D005872:Giardia / Q000472:pathogenicity*; D005873:Giardiasis / Q000150:complications / Q000175:diagnosis* / Q000188:drug therapy / Q000453:epidemiology; D006801:Humans