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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The human body produces and destroys 15 million blood cells every second.
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There are approximately 3 million unintended pregnancies in the United States each year.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.