Abstract
European genospecies of B. burgdorferi sensu lato were identified by examining unfed I. ricinus ticks collected from 10 locations in northwest Poland. Research was conducted using 3 methods: PCR amplification of the fla gene with the FLA1 and FLA2 primer set conserved in all European species of B. burgdorferi sensu lato, PCR-RFLP, and sequencing. There were 5 restriction patterns obtained in this study: 4 characteristic for genospecies B. burgdorferi sensu stricto, B. garinii, B. valaisiana, and B. afzelii and 1 untypical restriction pattern type. PCR products for all restriction patterns were sequenced and sequences have been submitted to GeneBank (accession numbers: AY603342, AY603343, AY603344, AY603345, AY603346). Polish sequences of the fla gene for B. burgdorferi s.s., B. garinii, B. valaisiana, and B. afzelii were identical with sequences from GeneBank at 99.79%, 99.58%, 100% and 100% respectively. The fifth sequence demonstrated 99.79% identity with sequences of a B. lusitaniae PotiB2 isolate from Portugal, and also clusters with this strain. B. lusitaniae DNA in I. ricinus was detected in 3 out of 10 localities and constituted 5.9% of infected individuals with I. ricinus.