EPIDEMIOLOGICAL STUDY OF DIPHTHERIA IN RETROSPECT.
D000293:Adolescent; D002648:Child; D004165:Diphtheria; D016021:Epidemiologic Studies; D006801:Humans; D007194:India; D007223:Infant; D012621:Seasons
ADOLESCENCE; CHILD; DIPHTHERIA; INDIA; INFANT; SEASONS