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Vaccines prevent between 2.5 and 4 million deaths every year.
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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).