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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
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Approximately 25% of all reported medication errors result from some kind of name confusion.