Evaluation of an attenuated strain of Ehrlichia canis as a vaccine for canine monocytic ehrlichiosis

► We assessed an attenuated strain of Ehrlichia canis as a vaccine for canine ehrlichiosis. ► Dogs vaccinated with a multi passaged Ehrlichia canis strain (#611A) were immunized. ► Azithromycin was not found to be effective against Ehrlichia canis.