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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.