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Vaccines prevent between 2.5 and 4 million deaths every year.
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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
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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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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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The familiar sounds of your heart are made by the heart's valves as they open and close.