Identification and methicillin resistance of coagulase-negative staphylococci isolated from nasal cavity of healthy horses.
Abstract: The aim of this study was an analysis of the staphylococcal flora of the nasal cavity of 42 healthy horses from 4 farms, along with species identification of CoNS isolates and determination of resistance to 18 antimicrobial agents, particularly phenotypic and genotypic methicillin resistance. From the 81 swabs, 87 staphylococci were isolated. All isolates possessed the gap gene but the coa gene was not detected in any of these isolates. Using PCR-RFLP of the gap gene, 82.8% of CoNS were identified: S. equorum (14.9%), S. warneri (14.9%), S. sciuri (12.6%), S. vitulinus (12.6%), S. xylosus (11.5%), S. felis (5.7%), S. haemolyticus (3.4%), S. simulans (3.4%), S. capitis (1.1%), S. chromogenes (1.1%), and S. cohnii subsp. urealyticus (1.1%). To our knowledge, this was the first isolation of S. felis from a horse. The species identity of the remaining Staphylococcus spp. isolates (17.2%) could not be determined from the gap gene PCR-RFLP analysis and 16S rRNA gene sequencing data. Based on 16S-23S intergenic transcribed spacer PCR, 11 different ITS-PCR profiles were identified for the 87 analyzed isolates. Results of API Staph were consistent with molecular identification of 17 (19.5%) isolates. Resistance was detected to only 1 or 2 of the 18 antimicrobial agents tested in the 17.2% CoNS isolates, including 6.9% MRCoNS. The mecA gene was detected in each of the 5 (5.7%) phenotypically cefoxitin-resistant isolates and in 12 (13.8%) isolates susceptible to cefoxitin. In total, from 12 horses (28.6%), 17 (19.5%) MRCoNS were isolated. The highest percentage of MRCoNS was noted among S. sciuri isolates (100%).
Publication Date: 2012-06-30 PubMed ID: 22752908DOI: 10.1007/s12275-012-1550-6Google Scholar: Lookup
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Summary
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The research study aimed to analyze the type of staphylococci present in the nasal cavity of healthy horses, identify the resistance of CoNS isolates to multiple antimicrobial agents, and identify their resistance to methicillin.
Sampling and Identification Results
- The researchers took samples from the nasal cavity of 42 healthy horses across 4 farms.
- From 81 nasal swabs, the researchers discovered 87 types of staphylococci.
- Every isolate possessed the gap gene, however, none possessed the coa gene.
- Through the use of PCR-RFLP of the gap gene, it was determined that 82.8% of CoNS were identified with various species. For instance, 14.9% were identified as S. equorum, and an equal percentage as S. warneri.
- The research also led to the first-ever identification of S. felis in a horse, which accounted for 5.7% of the isolates.
Undetermined Isolates
- The species of 17.2% of remaining Staphylococcus isolates could not be determined through gap gene PCR-RFLP analysis or 16S rRNA gene sequencing data. These were designated as ‘unknown’.
Methicillin Resistance
- Resistance to 1 or 2 of the 18 antimicrobial agents was found in 17.2% of the CoNS isolates.
- Out of these, 6.9% were MRCoNS or Methicillin-resistant coagulase-negative staphylococci.
- The mecA gene, a factor in methicillin resistance, was found in 5 (or 5.7%) isolates which also showed resistance to cefoxitin (a cephamycin antibiotic). It was also seen in 12 (or 13.8%) of the isolates that were susceptible to cefoxitin.
- In total, 17 MRCoNS were isolated from 12 horses, representing 28.6% of the horse population and 19.5% of the identified isolates.
- Among all species identified, S. sciuri had the highest percentage of MRCoNS at 100%.
Cite This Article
APA
Karakulska J, Fijałkowski K, Nawrotek P, Pobucewicz A, Poszumski F, Czernomysy-Furowicz D.
(2012).
Identification and methicillin resistance of coagulase-negative staphylococci isolated from nasal cavity of healthy horses.
J Microbiol, 50(3), 444-451.
https://doi.org/10.1007/s12275-012-1550-6 Publication
Researcher Affiliations
- Department of Immunology, Microbiology and Physiological Chemistry Faculty of Biotechnology and Animal Husbandry West Pomeranian University of Technology, Szczecin, Poland Doktora Judyma 24, 71-466, Szczecin, Poland.
MeSH Terms
- Animals
- Anti-Bacterial Agents / pharmacology
- Cluster Analysis
- Coagulase / genetics
- DNA, Bacterial / chemistry
- DNA, Bacterial / genetics
- DNA, Ribosomal / chemistry
- DNA, Ribosomal / genetics
- DNA, Ribosomal Spacer / chemistry
- DNA, Ribosomal Spacer / genetics
- Genes, Bacterial
- Genotype
- Horses
- Methicillin Resistance
- Microbial Sensitivity Tests
- Molecular Sequence Data
- Molecular Typing
- Nasal Cavity / microbiology
- Phylogeny
- Polymerase Chain Reaction
- Polymorphism, Restriction Fragment Length
- RNA, Ribosomal, 16S / genetics
- Sequence Analysis, DNA
- Staphylococcus / classification
- Staphylococcus / drug effects
- Staphylococcus / genetics
- Staphylococcus / isolation & purification
- Staphylococcus haemolyticus
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