Biotyping and genotyping were performed for Corynebacterium diphtheriae strains isolated from humans in Poland during last several years. All the strains belonged to the same biotype and genetic clone. Similar situation has not yet been described in international literature, although nontoxigenic C. diphtheriae strains have been isolated more frequently in developed countries. However, strains isolated and investigated in other countries revealed heterogeneity of biotypes and genotypes.
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