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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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Thyroid conditions may make getting pregnant impossible.
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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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There are 20 feet of blood vessels in each square inch of human skin.