title: Diphtheria: serologic study of 422 persons in Puerto Rico.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004165:Diphtheria / Q000276:immunology* / Q000517:prevention & control; D004166:Diphtheria Antitoxin / Q000032:analysis*; D004168:Diphtheria Toxoid / Q000627:therapeutic use; D005260:Female; D006386:Hemagglutination Tests; D006801:Humans; D008297:Male; D008875:Middle Aged; D011647:Puerto Rico
chemical_list: D004166:Diphtheria Antitoxin; D004168:Diphtheria Toxoid