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Emergence of staphylococcal cassette chromosome mec type Ⅰ with high-level mupirocin resistance among methicillin-resistant Staphylococcus aureus

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Asian Pacific Journal of Tropical Biomedicine 2017年第3期7卷 193-197页

作者： Prabhu Raj Joshi Mahesh Acharya Rajan Aryal Kamal Thapa Trishna Kakshapati Rathanin Seng Anjana Singh Sutthirat Sitthisak Central Department of Microbiology Tribhuvan UniversityKirtipurKathmanduNepal Department of Microbiology Kantipur College of Medical ScienceTribhuvan UniversitySitapailaKathmanduNepal Department of Microbiology Kathmandu College of Science and TechnologyTribhuvan UniversityKalimatiKathmanduNepal Department of Pathology Annapurna Neurological Institute and Allied SciencesMaitigharKathmanduNepal Department of Microbiology and Parasitology Faculty of Medical SciencesNaresuan UniversityPhitsanulokThailand Centre of Excellence in Medical Biotechnology Faculty of Medical ScienceNaresuan UniversityPhitsanulokThailand

Objective: To investigate the molecular epidemiology and antimicrobial resistance patterns of methicillin-resistant Staphylococcus aureus(MRSA) among healthcare workers and ***: MRSA isolates were recovered from nasal swabs collected at a tertiary care hospital of Nepal and confirmed on the basis of Gram staining, conventional biochemical tests, and PCR amplification of mec A gene. PCRs were also used for detection of the different resistance genes and staphylococcal cassette chromosome(SCC) mec *** susceptibility patterns of isolates were assessed by disc diffusion method and minimum inhibitory concentrations were determined by ***: A total of 29 MRSA were isolated from 536 nasal swabs(5.4%) of health care workers and patients at a tertiary care hospital in Nepal. All isolates were susceptible to amikacin, gentamicin, vancomycin(minimal inhibitory concentrations 1 024 mg/m L).Fourteen isolates were found harboring the mup A gene and one isolate was found carrying the novel mup B gene. High prevalence(68%) of SCCmec I type was found, followed by SCCmec V(13%) and SCCmec III(3%) among all the MRSA ***: We found the emergence of SCCmec type I with high-level mupirocin resistance among MRSA in Nepal. Data also suggest that MRSA SCCmec type V strain has spread from the community to the hospital.

关键词： Methicillin-resistant Staphylococcus aureus Staphylococcal cassette chromosome mec types Mupirocin resistance Nasal carriage

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