A localized infection of mucous membranes or skin caused by toxigenic strains of CORYNEBACTERIUM DIPHTHERIAE. It is characterized by the presence of a pseudomembrane at the site of infection. DIPHTHERIA TOXIN, produced by C. diphtheriae, can cause myocarditis, polyneuritis, and other systemic toxic effects.

Synonyms: Infection, Corynebacterium diphtheriae, Corynebacterium diphtheriae Infections, Corynebacterium diphtheriae Infection, Diphtheria