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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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.