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Background   Ixodes ricinus  ticks transmit  Babesia  species to vertebrate hosts. Using molecular tools we were able to detect the presence of this piroplasmid in its vector. The aims of this study were to investigate the prevalence and identity of  Babesia  species in questing ticks collected in various areas of Norway.    Methods  DNA from questing  l. ricinus  ticks were examined with a realtime PCR for the presence of  Babesia . Positive samples of tick DNA were identified to species using PCR, and sequence analysis.    Results  From a total of 1908 questing  l. ricinus  ticks, 17 (0.9%) indicated the presence of  Babesia  spp. after realtime-PCR screening.  Ixodes ricinus  harbouring  Babesia  spp. was detected in 9 out of 22 localities. Further molecular analyses of DNA from these positive ticks indicate the presence of  Babesia venatorum ,  B. divergens ,  B. capreoli  and a currently undescribed  Babesia  in Norwegian ticks. The most prevalent was  B. venatorum  found in 71% of the positive ticks.    Conclusions  A total of 17 out of 1908 (0.9%) ticks were positive for  Babesia . Our data confirm that there are several  Babesia  species in ticks in Norway.  Babesia venatorum  was the most prevalent. This species has a zoonotic potential and may cause human babesiosis following a tick bite.

Prevalence and diversity of Babesia spp. in questing Ixodes ricinus ticks from Norway