Incidence of diphtheria carriers among school children in Visakhapatnam.
D000293:Adolescent; D002353:Carrier State / Q000453:epidemiology*; D002648:Child; D004165:Diphtheria; D005260:Female; D006801:Humans; D007194:India; D008297:Male; D011153:Population; D012572:School Health Services