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Evidence for Borrelia bavariensis infections of Ixodes uriae within seabird colonies of the North Atlantic Ocean.
Applied and Environmental Microbiology 2017 August 12
The first report of members of the spirochete genus Borrelia in the seabird tick, Ixodes uriae , and seabird colonies occurred during the early 1990s. Since then, Borrelia spp. have been detected in these ticks and seabird colonies around the world. To-date, the primary species detected has been B. garinii , with rare occurrences of B. burgdorferi sensu stricto and B. lusitaniae. During our research on Borrelia and I. uriae in seabird colonies of Newfoundland and Labrador, Canada, we have identified B. bavariensis in I. uriae To our knowledge, B. bavariensis has previously only been found in the Eurasian tick species, I. persulcatus and I. ricinus, and it was believed to be a rodent-specific Borrelia ecotype. We found B. bavariensis within I. uriae from three seabird colonies, over three calendar years. We also reanalyzed B. garinii sequences collected from I. uriae from Eurasian seabird colonies, and determined that sequences from two Russian seabird colonies likely also represent B. bavariensis The Canadian B. bavariensis sequences from I. uriae analysed in this study cluster with previously described sequences from Asia. Overall, this is an important discovery that illustrates and expands the range of hosts and vectors for B. bavariensis and it raises questions regarding the possible mechanisms of pathogen dispersal from Asia to North America. Importance To our knowledge this is the first documentation of B. bavariensis outside Eurasia. Additionally, the bacterium was found in a marine ecosystem involving the seabird tick, I. uriae, and its associated seabird hosts. This indicates the epizootiology of B. bavariensis transmission is much different from what was previously described, with this species previously believed to be a rodent-specific ecotype, and indicates that this pathogen is established, or establishing, much more widely.
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