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Ribotype Delineation and Description of Staphylococcus sciuri Subspecies and Their Potential as Reservoirs of Methicillin Resistance and Staphylolytic Enzyme Genes

¹ North Carolina State University, Raleigh, North Carolina 27695-7614
² Qualicon, L. L. C., Wilmington, Delaware 19880-0402
³ The Rockefeller University, New York, New York 10021-6399
⁴ University of Alabama, Tuscaloosa, Alabama 35487-0334
⁵ University of Munich, Munich, Germany
⁶ Lund University, Lund S-223 62, Sweden

^* Corresponding author. Phone: (302) 695-1613. Fax: (302) 695-8557. E-mail: WEBSTEJA{at}A1.ESVAX.UMC.DUPONT.COM.

ABSTRACT

Three subspecies of Staphylococcus sciuri, S. sciuri subsp. sciuri Kloos, Schleifer, and Smith 1976, 23^AL emend. Kloos et al. 1996, S. sciuri subsp. carnaticus subsp. nov., and S. sciuri subsp. rodentium subsp. nov., are described on the basis of their ribotype patterns, DNA-DNA liquid hybridization data, and phenotypic characteristics. Normalized ribotyping subdivided the S. sciuri patterns into three blocks of patterns, each corresponding to a subspecies. Each subspecies formed a separate, well-defined DNA similarity group when DNA-DNA hybridizations were conducted under stringent (70°C) reassociation conditions. S. sciuri subsp. sciuri could be distinguished from the other subspecies on the basis of its ability to produce acid from D-cellobiose, alkaline phosphatase activity, and inability to produce either clumping factor or protein A. S. sciuri subsp. carnaticus could be distinguished by its ability to produce acid aerobically from D-xylose and maltose, inability to produce acid from D-melezitose, and smaller colony size on P agar. S. sciuri subsp. rodentium could be distinguished by its positive reaction in the latex agglutination test for clumping factor and/or protein A and generally higher frequencies and levels of oxacillin and methicillin resistance. All 40 strains of S. sciuri tested (including representatives of all three subspecies) hybridized with the mecA gene probe. All strains of S. sciuri subsp. sciuri, 79% of the strains of S. sciuri subsp. carnaticus and 89% of the strains of S. sciuri subsp. rodentium exhibited extracellular, staphylolytic enzyme activity. This activity was associated with an enzyme(s) that immunoblotted with a lysostaphin-specific monoclonal antibody; however, only three strains hybridized with a lysostaphin (end) gene probe. The type strain of S. sciuri subsp. carnaticus is DD 791 (= ATCC 700058), and the type strain of S. sciuri subsp. rodentium is DD 4761 (= ATCC 700061).

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