Summary: Genetic relationships among isolates assigned to and were determined by analysis of electrophoretically demonstrable allelic variation in 14 structural genes encoding metabolic enzymes. Among the 51 isolates analysed there were 25 electrophoretic types (ETs), among which mean genetic diversity per locus was 0.753. Cluster analysis of ETs demonstrated one well-defined group of 11 ETs representing solely the genotypes of all 17 isolates assigned to The remaining 14 ETs represented the genotypes of the 34 isolates of and With the exception of ATCC 13252, all strains of were closely related, whereas strains assigned to included distantly related lineages, some of which were similar to those of and should be assigned to this species. Thus, the study showed that there is no significant overall genetic similarity between and the two spp.


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