SUMMARY: The intra- and intergeneric relationships of the genus were determined by comparing long 16S rRNA sequences, generated by reverse transcriptase. All species formed a phylogenetically coherent cluster in which and constituted genetically well defined species. DSM 43322 (serotype 2) was not closely related to three other strains of this species (serotype 1) and, as judged from phylogenetic distances, could be accommodated within , or represent a new species. In contrast to previous findings, members of the genus appear to be related to Sequence information was used to develop an oligonucleotide probe for the serotype 1 strains, which did not react with the serotype 2 strain or with rRNA from strains of eight species.


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