tailieunhanh - Báo cáo khoa học: "Borrelia burgdorferi sensu lato in Ixodes ricinus ticks collected from migratory birds in Southern Norway"

Tuyển tập các báo cáo nghiên cứu về bệnh học thý y được đăng trên tạp chí Acta Veterinaria Scandinavica cung cấp cho các bạn kiến thức về bệnh thú yđề tài: Borrelia burgdorferi sensu lato in Ixodes ricinus ticks collected from migratory birds in Southern Norway. | Kjelland et al. Acta Veterinaria Scandinavica 2010 52 59 http content 52 1 59 AVS ACTAVETERINARIA SCANDINAVICA RESEARCH Open Access Borrelia burgdorferi sensu lato in Ixodes ricinus ticks collected from migratory birds in Southern Norway Vivian Kjelland1 Snorre Stuen2 Tone Skarpaas3 Audun Slettan1 Abstract Background Borrelia burgdorferi sensu lato . are the causative agent for Lyme borreliosis LB the most common tick-borne disease in the northern hemisphere. Birds are considered important in the global dispersal of ticks and tick-borne pathogens through their migration. The present study is the first description of B. burgdorferi prevalence and genotypes in Ixodes ricinus ticks feeding on birds during spring and autumn migration in Norway. Methods 6538 migratory birds were captured and examined for ticks at Lista Bird Observatory during the spring and the autumn migration in 2008. 822 immature I. ricinus ticks were collected from 215 infested birds. Ticks were investigated for infection with B. burgdorferi . by real-time PCR amplification of the 16S rRNA gene and B. burgdorferi . were thereafter genotyped by melting curve analysis after real-time PCR amplification of the hbb gene or by direct sequencing of the PCR amplicon generated from the rrs 16S -rrl 23S intergenetic spacer. Results B. burgdorferi . were detected in of the ticks. The most prevalent B. burgdorferi genospecies identified were B. garinii followed by B. afzelii and B. burgdorferi sensu stricto . Conclusion Infection rate in ticks and genospecies composition were similar in spring and autumn migration however the prevalence of ticks on birds was higher during spring migration. The study supports the notion that birds are important in the dispersal of ticks and that they may be partly responsible for the heterogeneous distribution of B. burgdorferi . in Europe. Background The main vector for Borrelia burgdorferi sensu lato . .