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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

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