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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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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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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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.