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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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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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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.