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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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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.