Background: can asymptomatically colonize the human anterior nares and skin, and nasal colonization by this bacterium represents a potential risk for development of invasive infections. The aim of this study was to determine the prevalence of nasal carriage among healthcare workers and students attending a university hospital and to characterize the isolates phenotypically and molecularly.

Methods: A cross-sectional study was performed with 324 volunteers. Cultures from nasal samples were obtained and isolates were characterized according to their antimicrobial susceptibility profile and four virulence factors-encoding genes. MRSA isolates were characterized regarding their oxacillin/cefoxitin susceptibility, SCC and REP-PCR types. Potential risks for and MRSA carriage were analyzed.

Results: Of 324 nasal samples, 42.9% were identified as , of which 28.8% were MRSA. carriers were significantly higher in males and students (OR = 2.898, 95%CI 1.553-5.410); however, no variables were associated with MRSA carriage. All isolates were susceptible to vancomycin and the highest rate of resistance was observed for penicillin (90.6%). All isolates harbored the gene, and 97.8%, the gene; 15.8% and 6.5% were positive for and genes, respectively. Among MRSA isolates, 45% carried the gene but were phenotypically susceptible to oxacillin/cefoxitin; two harbored the and none had genes. All MRSAs were distributed into six SCC types and type I (62.5%) was the most frequent. REP-PCR typing identified four main clusters among MRSA isolates.

Conclusion: High prevalence of healthcare workers and students were identified as nasal carriers of exhibiting different antimicrobial resistance profiles, including -positive oxacillin-susceptible (OS-MRSA) and the presence of virulence-encoding genes. Both cohorts may represent potential sources for the emergence of a successful strain highly adapted to the hospital environment.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7732402PMC
http://dx.doi.org/10.1155/2020/3808036DOI Listing

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