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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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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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The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.