title: [Survey on immune levels against diphtheria in Guangxi Province].
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D002681:China; D004165:Diphtheria / Q000276:immunology*; D005260:Female; D006801:Humans; D007114:Immunization; D007223:Infant; D008297:Male; D012737:Sex Factors