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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.
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Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
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The longest a person has survived after a heart transplant is 24 years.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.