Other examples of rickettsial organisms are Riskettsia rickettsi, which causes Rocky Mountain Spotted Fever and Ehrlichia risticii, which causes Potomac Fever in horses. (vetinfo.com)
Ticks are common parasites that carry rickettsial organisms that can cause debilitating illness in people and dogs. (texaswestveterinarian.com)
Wolbachia is a genus of rickettsial organisms (sort of like bacteria but not exactly). (vin.com)