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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.