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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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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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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.
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Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.