The bacterium that caused diphtheria was first described by Klebs in1883, and was cultivated by Loeffler in 1884, who applied Koch’s postulates and properly identified corynebacterium diphtheriae as the agent of the disease.

In 1884, Loeffler concluded that C. diphtheriae produced a soluble toxin, and there by provided the first description of a bacterial exotoxin.

Roux and Yersin(1888) discovered the diphtheria exotoxin and established it’s pathogenic effects.

The antitoxin was described by Von Behring(1890).

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