The Cayenne tick (Amblyomma cajennense) is a cold-sensitive species, active year-round in tropical and sub-tropical areas of the Caribbean and Mexico, extending southward throughout much of Central and South America. Populations within the US are confined primarily to south Texas, although collections of Cayenne ticks from Florida and coastal regions of other states bordering the Gulf of Mexico have been reported.
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The Cayenne tick is known to carry and transmit Rocky Mountain spotted fever south of the US border, and is suspected to vector other pathogens throughout much of it's range. Lab studies show that the Cayenne tick may also be capable of transmitting an equine piroplasmosis, called Theileria equi.