We performed an integrated genotypic and phenotypic analysis of 128 strains of the genera Burkholderia, , and in order to study the taxonomic structure of and its relationships with other species. Our data show that presumed strains isolated from cystic fibrosis patients belong to at least five distinct genomic species, one of which was identified as This group of five phenotypically similar species is referred to as the complex. The name is proposed for one of these genomic species, which was formerly referred to as genomovar II; the remaining groups are referred to as genomovars I, III, and IV, pending additional differential phenotypic tests. The role and pathogenic potential of each of these taxa, particularly in view of the potentially fatal infections in cystic fibrosis patients, need further evaluation. The data presented also demonstrate that and should be reclassified as species.


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