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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
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Cyanide works by making the human body unable to use oxygen.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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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.