Corynebacterium diphtheriae

**Definition:** A species of gram-positive, asporogenous bacteria in which three cultural types are recognized. These types (gravis, intermedius, and mitis) were originally given in accordance with the clinical severity of the cases from which the different strains were most frequently isolated. This species is the causative agent of DIPHTHERIA.

**Tree numbers:** - B03.510.024.250.150 - B03.510.460.400.400.200.150