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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.
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There are approximately 3 million unintended pregnancies in the United States each year.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Medication errors are three times higher among children and infants than with adults.