Which was the first disease found to be due to a protozoan that is introduced to humans by the bite of a hard body tick?

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Babesiosis was the first disease found to be due to a protozoan that is introduced to humans by the bite of a hard body tick. Cryptosporidiosis is caused by a protozoan that infects the intestine and is usually spread through contaminated water or food, and Toxoplasmosis is caused by a protozoan that is usually spread through exposure to infected cat feces or undercooked contaminated meat.

Which Was the First Disease Found to Be Due to a Protozoan