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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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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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Women are 50% to 75% more likely than men to experience an adverse drug reaction.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.