Local Population Structure and Seasonal Variability of Genotypes in Ticks, Slovakia.

Lyme disease (LD) is the most common tick-borne human disease in Europe, and , which is associated with avian reservoirs, is one of the most genetically diverse and widespread human pathogenic genospecies from the sensu lato (s.l.) complex. The clinical manifestations of LD are known to vary between regions and depend on the genetic strain even within genospecies. It is thus of importance to explore the genetic diversity of such pathogenic borreliae for the wide range of host and ecological contexts. In this study, multilocus sequence typing (MLST) was employed to investigate the local population structure of in ticks. The study took place in a natural wetland in Slovakia, temporally encompassing spring and autumn bird migration periods as well as the breeding period of resident birds. In total, we examined 369 and 255 ticks collected from 78 birds and local vegetation, respectively. s.l. was detected in 43.4% (160/369) of ticks recovered from birds and in 26.3% (67/255) of questing ticks, respectively. Considering the ticks from bird hosts, the highest prevalence was found for single infections with (22.5%). Infection intensity of in bird-feeding ticks was significantly higher than that in questing ticks. We identified ten sequence types (STs) occurring exclusively in bird-feeding ticks, two STs occurring exclusively in questing ticks, and one ST (ST 244) occurring in both ticks from birds and questing ticks. Four STs were detected for the first time herein. With the exception of ST 93, we detected different STs in spring and summer for bird-feeding ticks. Our results are consistent with previous studies of the low geographic structuring of genotypes. However, our study reveals some consistency in local ST occurrence and a geographic signal for one of the clonal complexes.