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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.