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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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.