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Streptococcus castoreus sp. nov., isolated from a beaver (Castor fiber)

¹ School of Food Biosciences, University of Reading, Whiteknights, Reading RG6 6AP, UK
² SAC Veterinary Services, Inverness, UK
³ Culture Collection, Department of Clinical Bacteriology, University of Göteborg, Sweden

Correspondence
Paul A. Lawson
p.a.lawson{at}reading.ac.uk

A previously undescribed, Gram-positive, catalase-negative, Streptococcus-like organism originating from a European beaver (Castor fiber) was subjected to a taxonomic study. The organism displayed -haemolytic activity and gave a positive reaction with Lancefield group A antisera. Based on the results of biochemical testing, the organism was tentatively identified as a member of the genus Streptococcus, but it did not correspond phenotypically to any recognized species of this genus. Comparative 16S rRNA gene sequencing studies confirmed this assignment, with the bacterium forming a hitherto unknown subline within the genus. Sequence divergence values of greater than 3 % from other reference streptococcal species, however, demonstrated that the unidentified coccus-shaped organism represents a hitherto unknown species. Based on phenotypic and molecular phylogenetic evidence, it is therefore proposed that the unknown organism from a beaver be classified as a novel species, Streptococcus castoreus sp. nov. The type strain is M605815/03/2^T (=CCUG 48115^T=CIP 108205^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain CCUG 48115^T is AJ606047.

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