Vegan rickettsial fever was a type of disease.

James T. Kirk came down with Vegan rickettsial fever on his first training assignment. He was given medicine which smelled like a mixture of seaweed, formaldehyde and coffee, a local concoction which was all the colonists had had to offer. Years later, in 2269, Kirk relived the delirium of the fever and the smell of the medicine in a hallucination induced by the thought-shield on Organia. (TOS novel: Spock Must Die!)

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