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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.
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Excessive alcohol use costs the country approximately $235 billion every year.
Examples of three types of joints found in the body.