Collection strains (21) and non-pigmented clinical isolates (96) provisionally identified as spp. were classified numerically on the basis of pyrolysis mass spectrometry (PMS) data and reaction patterns in conventional tests (CTRPs) for volatile and non-volatile fatty acids, pre-formed enzymes and biochemical activity. PMS and CTRP classifications were compared with a previous classification based on visual analysis of SDS-PAGE patterns. Although the order of clusters differed, cross-tabulation of cluster membership revealed strong correlations between classifications. Cluster membership in the PMS classification correlated particularly well with SDS-PAGE results. CTRP clusters corresponded largely to the recognised species of , but PMS and SDS-PAGE divided two species into sub-groups: two in and five in . The latter subgroups could be discriminated by small but consistent differences in CTRPs. An undesignated, well differentiated cluster of strains appeared closest to the main group of strains in PMS and CTRPs. could not be distinguished from ; these species are regarded as synonymous. Strains of and were well separated from other strains in PMS. A complex comprising clusters of and a further undesignated group similar to was well differentiated from and in PMS; clusters corresponding to and formed another complex.


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