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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 over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.