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- W2005092009 abstract "In an effort to explore the origin and/or reservoirs of the genetic determinant(s) of methicillin resistance in Staphylococcus aureus, we examined over 200 strains representing 13 different species within the genus Staphylococcus for the presence of the mecA gene, using a DNA probe internal to this gene prepared from a methicillin-resistant strain of S. aureus. Occasional mecA- positive isolates were detected among several staphylococcal species. On the other hand, each one of the 134 isolates of Staphylococcus sciuri, a species considered taxonomically the most primitive among staphylococci and found primarily on rodents and primitive mammals, gave positive reaction with the DNA probe when tested under conditions of high stringency. About two thirds (99) of these isolates, all of which belonged to S. sciuri subspecies sciuri, as well as 9 of the 11 species carnaticum isolates, showed only marginal, if any, resistance to methicillin (minimal inhibitory concentration of 0.75–6.0 μg/ml), while most of the remaining isolates that belonged to the subspecies rodentius (13 isolates in all) expressed antibiotic resistance with a heterogeneous phenotype similar to those seen in many methicillin-resistance strains of S. aureus In Smal digests of chromosomal DNA isolated from such methicillin-resistant S. aureus–like strains, the mecA probe hybridized with DNA fragments in the range of 145–180 kb, while in subspecies sciuri and carnaticum isolates the mecA hybridizing fragment was located in the SmaI fragment with the highest molecular size (≥400 kb). A DNA probe comprising an internal sequence to the regulatory gene mecI from Staphylococcus epidermidis identified the presence of sequences with low degree of homology in isolates of the three S. sciuri subspecies. The mecA-reacting sequences in these bacteria differed from mecA of S. aureus in several respects (e.g., by the absence of a ClaI restriction site from mecA of subspecies sciuri and carnaticum, and in some isolates of subspecies rodentius. The uniform presence of mecA in each one of a large number of S. sciuri strains belonging to distinct ribotypes and macrorestriction patterns and recovered over a 20-year period from a wide variety of animal sources and geographic sites suggests that mecA may be a native genetic element with an as yet unidentified physiologic function in this staphylococcal species." @default.
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- W2005092009 title "Ubiquitous Presence of a<i>mecA</i>Homologue in Natural Isolates of<i>Staphylococcus sciuri</i>" @default.
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- W2005092009 doi "https://doi.org/10.1089/mdr.1996.2.377" @default.
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