Agriculture officials say an invasive tick that could threaten cattle has been found in at least eight counties in Tennessee. The invasive Asian longhorned tick has been discovered in Claiborne, Cocke, Jefferson, Knox, Putnam and Sevier counties. The ticks were detected in Roane and Union counties earlier this year. The tick may transmit Theileriosis in cattle. Experts say heavy infestations can cause blood loss and kill cattle. The Centers for Disease Control and Prevention says there is no evidence that the tick has sickened humans in the U.S. Cattle and dogs are susceptible to tick bites. Livestock producers and dog owners are advised to check their animals for the ticks.