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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The FDA recognizes 118 routes of administration.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.