The changes in the nomenclature of species in the genus Staphylococcus, including the most pathogenic cluster of the coagulase-positive staphylococci, are represented. Presently, besides S. aureus, this cluster consists of 6 species: S. intermedius, S. schleiferi ssp. coagulans, S. lutrae, S. hyicus, S. pseudintermedius, and S. delphini. A particular attention was paid to the Staphylococcus intermedius group (SIG), which includes three closely related coagulase-positive bacterial species: S. intermedius, S. pseudintermedius, and S. delphini. The hosts of SIG species are various mammals and birds, which live in a close contact with humans. The current knowledge about the virulence factors and pathogenicity for animals and humans are analyzed. The diffic6lties of the species identification, the features of ecology and epidemiology, antimicrobial resistance were reviewed. The biological features of S. pseudintermedius, which has the greatest similarity with S. aureus, are considered in the context of the properties of newly emerging pathogens.
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