1887

Abstract

The genetic relationship and population structure of subspecies I strains were analysed using nucleotide sequences of four genes (, , and ). Fifteen strains from the reference collection B (SARB), belonging to 13 serovars, were analysed. Sequence data of two housekeeping genes, and , of the same 15 strains reported by Brown (2003) ( , 15676–15681) were also included in the analyses. Phylogenetic analysis revealed that there was a lack of congruence among the six gene trees. Split decomposition analysis resolved only five strains with a network structure, while others showed a star phylogeny. Compatibility values for the SARB strains were the lowest in comparison to those for strains representing different subspecies of . These results showed that the genes studied have undergone frequent recombination, suggesting a low level of clonality within subspecies I of .

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2006-04-01
2019-10-15
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