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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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There are 60,000 miles of blood vessels in every adult human.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.