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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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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Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.
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The average office desk has 400 times more bacteria on it than a toilet.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.