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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The average office desk has 400 times more bacteria on it than a toilet.
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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.