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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Vaccines prevent between 2.5 and 4 million deaths every year.