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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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Medication errors are three times higher among children and infants than with adults.
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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.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.