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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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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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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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There are 20 feet of blood vessels in each square inch of human skin.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").