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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.