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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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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.