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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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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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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.