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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The longest a person has survived after a heart transplant is 24 years.