It works by neutralizing the toxins produced by "Corynebacterium diphtheriae". C3 toxin of C. botulinum; and Diphtheria toxin of Corynebacterium diphtheriae. Cutaneous diphtheria is an infection of the skin by "Corynebacterium diphtheriae". Current nomenclature is "Corynebacterium diphtheriae". Corynebacterium diphtheriae is the pathogenic bacterium that causes diphtheria. Diphtheria vaccine is a vaccine against "Corynebacterium diphtheriae", the bacterium that causes diphtheria. The portals of entry for "Corynebacterium diphtheriae" are the nose, tonsils, and throat. "Clostridium tetani" and "Corynebacterium diphtheriae" respectively. Rarely bacteria such as "Neisseria gonorrhoeae", "Corynebacterium diphtheriae", or "Haemophilus influenzae" may be the cause. In 1883, Klebs successfully identified the bacterium "Corynebacterium diphtheriae" as the etiological cause of diphtheria.