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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.