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 is a tick-borne disease caused by the protozoan parasite Babesia. It was first discovered in cattle in Europe in the late 19th century and was later found to infect humans in the United States. The disease is transmitted to humans through the bite of an infected hard body tick, typically of the genus Ixodes. Symptoms of babesiosis in humans include fever, chills, headache, muscle and joint pain, and hemolytic anemia.

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