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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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There are approximately 3 million unintended pregnancies in the United States each year.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.