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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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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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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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.