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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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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.