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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.