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Characterization of Staphylococcal Cassette Chromosome mec Elements from Methicillin-Resistant Staphylococcus pseudintermedius Infections in Australian Animals.
- Source :
-
MSphere [mSphere] 2018 Nov 07; Vol. 3 (6). Date of Electronic Publication: 2018 Nov 07. - Publication Year :
- 2018
-
Abstract
- We examined the oxacillin resistance phenotype and genomic structure of staphylococcal cassette chromosome mec (SCC mec ) elements from 77 veterinary methicillin-resistant Staphylococcus pseudintermedius (MRSP) isolates. Isolates were characterized by oxacillin broth microdilution, whole-genome sequencing, and bioformatics analysis. Five previously described SCC mec elements, and a sixth novel element, were identified: SCC mec III (also known as II-III), ΨSCC mec <subscript>57395</subscript> , and SCC mec <subscript>NA45</subscript> (a SCC mec VII variant), all previously described in MRSP, and SCC mec IVg and SCC mec V <subscript>T</subscript> , previously described in both methicillin-resistant Staphylococcus aureus (MRSA) and MRSP. The sixth element was novel and found among nine geographically clustered isolates. This novel pseudostaphylococcal cassette chromosome (ΨSCC mec <subscript>KW21</subscript> ) contained a class A mec gene complex but lacked ccr genes. It also harbored heavy metal (cadmium) resistance determinants. The median oxacillin MIC values among ΨSCC mec <subscript>KW21</subscript> , SCC mec III, and SCC mec V <subscript>T</subscript> isolates were significantly higher than those determined for the SCC mec <subscript>NA45</subscript> VII variant isolates and ΨSCC mec <subscript>57395</subscript> and SCC mec IVg isolates. ΨSCC mec <subscript>KW21</subscript> was found exclusively in sequence type 497 (ST497), an MRSP clone that is locally successful in Victoria, Australia. Future studies are necessary to determine if this clone has disseminated further afield and if ΨSCC mec <subscript>KW21</subscript> has moved into other MRSP lineages or staphylococcal species. IMPORTANCE Staphylococcus pseudintermedius is a significant veterinary pathogen and occasional cause of infections in humans. β-Lactams are an important group of antimicrobials used to treat staphylococcal infections in humans and animals. However, when staphylococci become methicillin resistant via the acquisition of a mobile genetic element called staphylococcal cassette chromosome mec (SCC mec ), they become resistant to all β-lactams. This study detected a novel SCC mec element among a cluster of methicillin-resistant S. pseudintermedius isolates from animals in Australia. It also detected SCC mec elements in S. pseudintermedius that had high similarity to those identified in methicillin-resistant Staphylococcus aureus , demonstrating how human and animal pathogens can share the same resistance determinants.<br /> (Copyright © 2018 Worthing et al.)
- Subjects :
- Animals
Anti-Bacterial Agents pharmacology
Australia
Computational Biology
Microbial Sensitivity Tests
Oxacillin pharmacology
Staphylococcal Infections microbiology
Staphylococcus drug effects
Staphylococcus isolation & purification
Whole Genome Sequencing
Animal Diseases microbiology
Chromosomes, Bacterial
Genomic Islands
Methicillin Resistance
Staphylococcal Infections veterinary
Staphylococcus genetics
Subjects
Details
- Language :
- English
- ISSN :
- 2379-5042
- Volume :
- 3
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- MSphere
- Publication Type :
- Academic Journal
- Accession number :
- 30404937
- Full Text :
- https://doi.org/10.1128/mSphere.00491-18