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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.