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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
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Cyanide works by making the human body unable to use oxygen.
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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.