Abstract
The genus Brucella consists of a small coherent group of very closely related bacteria. Largely on the basis of preferred natural host, which shows a fairly close correlation with phage sensitivity and ability to oxidise certain substrates, the genus has been divided into six species, three of which have been subdivided into biovars(Corbel and Brinley Morgan 1984). On genetic grounds there is little justification for the recognition of separate species within the genus as no evidence of subdivision has been detected by DNA-DNA hybridisation. Indeed, on this basis it has been suggested that the classification should be amended to recognise that the genus comprises a single species, Brucella melitensis, with the currently recognised nomen species identified as its biovars (Verger et al. 1985). However, recent studies on the genomic structure have indicated that the current types are probably derived from an ancestral form most closely resembling B. suis biovar 3 (Jumas-Bilak et al. 1998). Thus on genetic grounds the various members of the genus should be classified as variants of B. suis. However, no system of nomenclature based on genetic structure has yet been proposed.
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Corbel, M.J. (2001). Microbiological Aspects. In: Madkour’s Brucellosis. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-59533-2_6
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DOI: https://doi.org/10.1007/978-3-642-59533-2_6
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