title: A study of diphtheria cases among hospital admissions in Calcutta during 1969.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D004165:Diphtheria / Q000453:epidemiology* / Q000235:genetics; D005260:Female; D006760:Hospitalization; D006801:Humans; D007194:India; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D012621:Seasons; D012737:Sex Factors