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PEREZ, Norton; PAVAS, Norma  and  RODRIGUEZ, Emma Isabel. Antimicrobial resistance of Staphylococus aureus at a hospital from the Colombian Orinoquia. Infect. [online]. 2010, vol.14, n.3, pp.167-173. ISSN 0123-9392.

Objective: Analyze the antimicrobial resistance patterns of Staphylococcus aureus at a hospital in Villavicencio, Colombia from 2005 to 2009. Design: Retrospective cohort study Setting: Villavicencio Departamental Hospital, a second and third level care center Target population: Patients’ microbiological records showing positive strains for S. aureus were analyzed. Interventions: None Variable: Methicillin resistance Outcomes: Antimicrobial resistance Results: Nine hundred and seventy six strains of S. aureus were isolated from 29,451 microbiological screened samples, and their antimicrobial resistance pattern was analyzed by standard micro-dilution broth tests. 49.6% strains were resistant to methicillin, and their co-resistance was higher mainly to gentamycin (25%), ciprofloxacin (25.1%), clindamycin (29.4%) and erythromycin (31.0), but lower to trimethoprim/sulfamethoxazole (11.8%). Although co-resistance to vancomycin was supposed to be low, some intermediate range and resistant isolates were found, but this statement cannot be established because they were not confirmed at a referenced laboratory. Tetracycline resistance was high even for methicillin sensitive stains. No resistance to linezolid was identified. Resistance to tigecycline was not evaluated. Conclusions: S. aureus resistance to methicillin is also common at the target hospital in the Colombian Orinoco region. Co-resistance is higher particularly to gentamycin, ciprofloxacin and clindamycin in methicillin resistant strains. High sensitivity to these antimicrobials is evidenced when S. aureus is also sensitive to methicillin. Some findings related to sensitivity to ciprofloxacin and clindamycin in the presence of methicillin resistance suggest the possibility of community- associated strains in Villavicencio as well as in other Colombian cities. This possibility deserves further confirmatory research.

Keywords : Staphylococcus aureus; Methicillin- Resistant Staphylococcus aureus; Microbial Sensitivity Tests; Microbial Drug Resistance; Bacterial Drug Resistance; Colombia.

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