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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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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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As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.