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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The horizontal fraction bar was introduced by the Arabs.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.