Some observations on diphtheria in Delhi.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D004165:Diphtheria / Q000453:epidemiology* / Q000401:mortality; D006801:Humans; D007194:India; D007223:Infant; D007231:Infant, Newborn; D012621:Seasons