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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Illicit drug use costs the United States approximately $181 billion every year.
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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.