Tick-borne bacterial infections in dogs: seroprevalences of Anaplasma phagocyto philum, Borrelia burgdorferi sensu lato and Ehrlichia canis in Germany [article in German] - Krupka, I; Pantchev, N; Weise, M; Lorentzen, L; Straubinger, RK (Prakt Tierarzt, 2007)