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Systematics and Evolution |
Departments of Molecular and Structural Biology1 and Medical Microbiology and Immunology4, University of Aarhus, DK-8000 Aarhus C, Denmark
Departments of Clinical Biochemistry2 and Clinical Microbiology5, Aalborg Hospital, DK-9000 Aalborg, Denmark
Department of Clinical Microbiology, Statens Serum Institut, DK-2300 Copenhagen S, Denmark3
Author for correspondence: Niels Nørskov-Lauritsen. Tel: +45 9932 3207. Fax: +45 9932 3216. e-mail: nnl{at}aas.nja.dk
A 453 bp fragment of infB, the gene encoding translation initiation factor 2, was sequenced and compared from 66 clinical isolates and type strains of Haemophilus species and related bacteria. Analysis of the partial infB sequences obtained suggested that the human isolates dependent on X and V factor, H. influenzae, H. haemolyticus, H. aegyptius and some cryptic genospecies of H. influenzae, were closely related to each other. H. parainfluenzae constituted a heterogeneous group within the boundaries of the genus, whereas H. aphrophilus/paraphrophilus and Actinobacillus actinomycetemcomitans were only remotely related to the type species of the genus Haemophilus. H. parahaemolyticus and H. paraphrohaemolyticus took up an intermediary position and may not belong in the genus Haemophilus sensu stricto. Ambiguous results were obtained with seven isolates tentatively identified as H. segnis, which fell into two discrete clusters. The delineation of ‘Haemophilus sensu stricto’ as suggested by infB analysis supports previous results obtained by DNA hybridization, in contrast to the delineation inferred from 16S rRNA sequence comparison.
Keywords: Pasteurellaceae, taxonomy, 16S rRNA
The GenBank accession numbers for the sequences reported in this paper are AJ289629 through AJ289694, AJ290742 through AJ290767, and AJ295746.
a Present address: Danish Institute of Agricultural Sciences, Research Centre Foulum, DK-8830 Tjele, Denmark.
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