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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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Illicit drug use costs the United States approximately $181 billion every year.
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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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There are more sensory neurons in the tongue than in any other part of the body.