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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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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").