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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.