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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The horizontal fraction bar was introduced by the Arabs.
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As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.