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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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People about to have surgery must tell their health care providers about all supplements they take.
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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
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The longest a person has survived after a heart transplant is 24 years.