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The human body produces and destroys 15 million blood cells every second.
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The average office desk has 400 times more bacteria on it than a toilet.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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The longest a person has survived after a heart transplant is 24 years.
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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.