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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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There are more sensory neurons in the tongue than in any other part of the body.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.