Intestinal parasite study in tour group to U.S.S.R., 1975.
D000293:Adolescent; D000328:Adult; D002170:Canada; D005260:Female; D006801:Humans; D007411:Intestinal Diseases, Parasitic / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D014195:Travel; D014586:USSR