A study of susceptibility status to diptheria.
D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D004165:Diphtheria / Q000276:immunology*; D005260:Female; D006801:Humans; D007194:India; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D012424:Rural Population; D012882:Skin Tests; D014505:Urban Population