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Amblyomma americanum, or lone star tick, is a species of tick in the genus Amblyomma. It is very wide-spread in the United States ranging from Texas to Iowa in the Midwest and east to the coast where it can be found as far north as Maine. Like all ticks, it is capable of vectoring diseases including human granulocytic ehrlichiosis (Ehrlichia chaffeensis), canine and human granulocytic ehrlichiosis (Ehrlichia ewingii), tularemia (Francisella tularensis), and Southern tick-associated rash illness (STARI, possibly cause by the spirochete Borrelia lonestari) STARI exhibits a rash similar to that caused by Lyme disease but is generally considered to be less severe. Though the bacteria responsible for Lyme disease, Borrelia burgdorferi, has occasionally been isolated from lone star ticks, numerous vector competancy tests have demonstrated that this tick is extremely unlikely to be capable of transmitting Lyme disease.
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