Mesh : Adolescent Adult Aged Algorithms Antibodies, Bacterial / blood Bacterial Typing Techniques Child Child, Preschool Corynebacterium / classification isolation & purification Corynebacterium diphtheriae / isolation & purification Diphtheria / diagnosis immunology microbiology Diphtheria Toxin / immunology Female Humans Laboratories Male Middle Aged Serologic Tests Specimen Handling