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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.