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

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.

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The Food and Drug Administration has approved Risperdal, an adult antipsychotic drug, for the symptomatic treatment of irritability in children and adolescents with autism. The approval is the first for the use of a drug to treat behaviors associated with autism in children. These behaviors are included under the general heading of irritability and include aggression, deliberate self-injury, and temper tantrums.

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The average adult has about 21 square feet of skin.

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