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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.