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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.