Cutaneous infection by non-diphtheria-toxin producing and penicillin-resistant strain in a patient with diabetes mellitus.

Diphtheria is a potentially fatal infection, mostly caused by diphtheria toxin (DT)-producing strains. During the last decades, the isolation of DT-producing strains has been decreasing worldwide. However, non-DT-producing strains emerged as causative agents of cutaneous and invasive infections.