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Background  Bovine anaplasmosis has been reported in several European countries, but the vector competency of tick species for  Anaplasma marginale  from these localities has not been determined. Because of the wide distributional range of  Dermacentor reticulatus  within Europe and the major role of  Dermacentor  spp. as a vector of  A. marginale  in the United States, we tested the vector competency of  D. reticulatus  for  A. marginale .    Results  Male  D. reticulatus  were allowed to feed for 7 days on a calf persistently infected with a Zaria isolate of  A. marginale , after which they were removed and held off-host for 7 days. The ticks were then allowed to feed a second time for 7 days on a susceptible tick-naïve calf. Infection of calf No. 4291 was detected 20 days post exposure (p.i.) and confirmed by  msp4  PCR. Thirty percent of the dissected acquisition fed ticks was infected. In addition,  A. marginale  colonies were detected by light microscopy in the salivary glands of the acquisition fed ticks. Transmission of  A. marginale  to calf No. 9191 was confirmed by examination of Giemsa-stained blood smears and  msp4  PCR. Ticks were dissected after transmission feeding and presence of  A. marginale  was confirmed in 18.5% of the dissected ticks.    Conclusion  This study demonstrates that  D. reticulatus  males are competent vectors of  A. marginale . Further studies are needed to confirm the vector competency of  D. reticulatus  for other  A. marginale  strains from geographic areas in Europe.

Experimental transmission of Anaplasma marginale by male Dermacentor reticulatus