Not all ticks carry diseases, but it's impossible to tell which do, so you should always take precautions. The diseases spread by ticksvary depending on the species. Lonestar ticks can spread ehrlichiosis, tularemia, Heartland virus, Bourbon virus, and southern tick-associated rash illness (STARI). Dog ticks can spread Rocky Mountain spotted fever and Boutonneuse fever. Rocky Mountain spotted wood ticks can spread Rocky Mountain spotted fever, Colorado tick fever, tularemia, and tick paralysis. Deer ticks can spread Lyme disease, anaplasmosis, B. miyamotoi disease, ehrlichiosis, babesiosis, and Powassan virus.
However, a tick must be attached for thirty-six hours to transmit diseases. Still, they may go unnoted due to the anesthetic this pest injects when they bite.