Emergence of a community-associated methicillin-resistant Staphylococcus aureus with unique resistance profile in Southwest of Nigeria
Creators: name: Ghebremedhin, B.
name: Olugbosi, M. O.
name: Raji, A. M.
name: Layer, Franziska
name: Bakare, R. A.
name: König, B.
name: König, Wolfgang
Publisher: name: Robert Koch-Institut
Year: 2009
Subjects: subject: Adolescent
subject: Preschool
subject: DNA
subject: Humans
subject: Genotype
subject: Hospitals
subject: Cluster Analysis
subject: Middle Aged
subject: Nigeria/epidemiology
subject: Child
subject: Adult
subject: Sequence Analysis
subject: Genetic Variation
subject: Microbial Sensitivity Tests
subject: Young Adult
subject: Bacterial Typing Techniques
subject: Anti-Bacterial Agents/pharmacology
subject: Molecular Epidemiology
subject: DNA Fingerprinting
subject: Bacterial Toxins/genetics
subject: Community-Acquired Infections/epidemiology
subject: Community-Acquired Infections/microbiology
subject: Conjunctivitis/microbiology
subject: Methicillin-Resistant Staphylococcus aureus/classification
subject: Methicillin-Resistant Staphylococcus aureus/isolation &amp; purification
subject: Otitis/microbiology
subject: Soft Tissue Infections/microbiology
subject: Staphylococcal Infections/epidemiology
subject: Staphylococcal Infections/microbiology
subject: Staphylococcal Skin Infections/microbiology
subject: Surgical Wound Infection/microbiology
subject: Urban Population
subject: 610 Medizin

description: Pheno-, genotypic and toxin gene analysis has not been done yet all in one for Nigerian Staphylococcus aureus population. This study provides a comprehensive overview on the molecular epidemiology and genetic diversity of S. aureus at the largest university clinic in Ibadan, Nigeria. At the University Teaching Hospital in Ibadan, Nigeria, out of 1300 patients' clinical samples 346 non-duplicate S. aureus isolates were obtained during the 1-year-surveillance in 2007. All isolates underwent antibiotic susceptibility testing, toxin gene analysis, MLST (multilocus sequence typing), agr group and spa typing. And for MRSA SCCmec typing was performed. 20.23% of the 346 isolates were methicillin-resistant. 33 patients' isolates (47.15%) fulfilled the definition criteria for CA-MRSA according to the review of the medical charts. The majority of MRSA strains analyzed were isolated from surgical and paediatric patients. The commonest types of infection identified with MRSA were surgical site infections (&gt;70%) whereas for CA-MRSA were conjunctivitis and otitis in 19 patients (57.6%) and accidental skin and subcutaneous tissue infection in 14 patients (42.4 %). The MSSA strains (ST1, ST5, ST15, ST7, ST8, ST25, ST30, ST72, ST80, ST121 and ST508) were heterogeneous by pheno- and genotypic analysis. The first report and genetic analyses of PVL-positive ST88 strain (agr III, SCCmec IV) in Nigeria is shown in this study. ST88 was resistant to trimethoprim-sulfamethoxazole besides to penicillin and oxacillin. CA-MRSA infections are rapidly increasing among young patients with ophthalmologic and auricular infections. Urban regions of lower socioeconomic status and evidence of overcrowding appear to be at higher risk for the emergence of this clone.