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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.
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Thyroid conditions may make getting pregnant impossible.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.