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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
Did you know?
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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Blood is approximately twice as thick as water because of the cells and other components found in it.