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There isn't currently a Lyme disease vaccine on the U.S. market. Researchers are hoping to change that.
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The chance of catching Lyme disease from an individual tick ranges from zero to roughly 50 percent. Three factors matter: the tick species, where it came from and how long the tick was feeding.
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The tick-borne illness is spreading north and south — about 300,000 U.S. cases a year. As scientists work on better diagnostic tests and surveillance tools, you can take steps to cut your risk.