Environmental health.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000818:Animals; D001634:Bibliographies as Topic; D001717:Birds; D002417:Cattle; D002648:Child; D002675:Child, Preschool; D003140:Communicable Disease Control; D003153:Community Health Services; D004782:Environmental Health; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D051379:Mice; D008875:Middle Aged; D011247:Pregnancy; D011315:Preventive Medicine; D014330:Tropical Medicine