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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.