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Streptococcus intestinalis Robinson et al. 1988 and Streptococcus alactolyticus Farrow et al. 1984 are phenotypically indistinguishable

¹Laboratory of Microbiology, Faculty of Sciences, University of Ghent, B-9000 Ghent, Belgium
³Faculty of Veterinary Medicine, University of Ghent, B-9000 Ghent, Belgium
²Laboratory of Medical Microbiology, University Hospital Antwerp UIA, Antwerp, Belgium

Author for correspondence: P. Vandamme. Tel: +32 9 264 5113. Fax: +32 9 264 5092. e-mail: Peter.Vandamme@rug.ac.be

ABSTRACT

The one-dimensional whole-cell protein patterns and a variety of biochemical characteristics of the type and reference strains of Streptococcus intestinalis and Streptococcus alactolyticus were studied. All the data revealed that strain of both species were indistinguishable. Reported differences in haemolytic activity and presence of Lancefield antigens were not reproduced. All strains were -haemolytic. The S. intestinalis type strain possessed the group G antigen, but a second S. intestinalis reference strain and all of the S. alactolyticus strains possessed the group D antigen. All strains produced urease activity (albeit some after prolonged incubation), a characteristic considered important for S. intestinalis. Given the congruence between wholecell protein electrophoresis and percentage of DNA-DNA hybridization, these data suggest that Streptococcus intestinalis Robinson et al. 1988 is a junior synonym of Streptococcus alactolyticus Farrow et al. 1984.

Key Words: Streptococcus intestinalis • Streptococcus alactolyticus. SDS-PAGE • taxonomy

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