Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
Human immunodeficiency virus gains entry into helper T cells, uses the cell DNA to replicate, interf