The bacterium Borrelia burgdorferi and Borrelia mayonii are typically the leading cause of Lyme disease in the United States. These bacteria live in ticks and are transmitted to humans when the ticks bite the host, in this case, the human. In the United States, deer ticks are typically found in these regions:
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Pacific coast (i.e., northern California)
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North Central United States
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Northeast
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Upper Midwest
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Mid-Atlantic
The infected black-legged ticks often attach to unsuspecting hikers or people traveling through wooded areas. Due to their small size, it is hard to spot ticks. When tick bites happen, the bacteria eventually enter the human bloodstream through broken skin tissues. The longer a tick is attached to the host, the much higher the likelihood of Lyme disease transmission (typically 36-48 hours).