1887

Abstract

is a fastidious bacterium associated with infections in humans and cats. The mechanisms involved in the long-term survival of bartonellae despite vigorous host immune responses are poorly understood. Generation of genetic variants is a possible strategy to circumvent the host specific immune responses. The authors have recently demonstrated the coexistence of different genetic variants within the progeny of three primary isolates from Berlin by PFGE analysis. Aims of the present study were to determine whether coexistence of different variants is a common feature of isolates worldwide and whether the genetic variants originally emerged . Thirty-four primary isolates from different geographical regions were analysed by subjecting multiple single-colony-derived cultures to PFGE analysis. Up to three genetic variants were detected within 20 (58.8 %) isolates, indicating that most primary isolates display a mosaic-like structure. The close relatedness of the genetic variants within an isolate was confirmed by multi-locus sequence typing. In contrast to the primary isolates, no genetic variants were detected within the progeny of 20 experimental clones generated from 20 primary isolates, suggesting that the variants were not induced during the procedure of PFGE analysis. Hence, the genetic variants within a primary isolate most likely originally emerged . Consideration of the mosaic structure of primary isolates is essential when interpreting typing studies on .

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2007-07-01
2020-07-16
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