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Lyme disease is a bacterial infection transmitted by the bite of a tick. In the U.S., the bacterium responsible for Lyme disease is Borrelia burgdorferi. Infected ticks typically pick up the bacterium after biting an infected animal, such as a deer, raccoon, or squirrel.
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Lyme disease is a bacterial infection transmitted by the bite of a tick. In the U.S., the bacterium responsible for Lyme disease is Borrelia burgdorferi. Infected ticks typically pick up the bacterium after biting an infected animal, such as a deer, raccoon, or squirrel. When an infected tick then bites a person, Lyme disease can take hold.
Lyme disease was first recognized in the 1970s after several children were diagnosed with juvenile rheumatoid arthritis in Lyme, Conn., and several neighboring towns. Infected individuals experienced a rash followed by arthritis symptoms, and many of the children reported having had a tick bite. The symptoms mostly started in the summer months, which coincided with tick season. Investigations eventually uncovered that deer ticks were responsible for transmitting Lyme disease.
Lyme disease is much more prevalent in the Northeastern U.S. and Midwest, but every state has had reported cases. The number of confirmed cases of Lyme disease rose from approximately 11,500 cases in 1995 to approximately 25,000 cases in 2014 nationwide, according to the Centers for Disease Control (CDC).1 In 2014, 95% of all cases were reported from 14 states, all in the Eastern U.S. and Midwest.
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