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Anales de la Facultad de Ciencias Médicas (Asunción)

Print version ISSN 1816-8949


DAVALOS, Katrin et al. Nasal behave of staphylococcus aureus in personal of the hospital in intensive cares adults units. An. Fac. Cienc. Méd. (Asunción) [online]. 2008, vol.41, n.1-2, pp.56-63. ISSN 1816-8949.

Objectives: A multicenter study was performed with the aim of determining the frequency of nasal carriers of S. aureus, antimicrobial susceptibility and risk factors of the carrying in Health staff of Intensive Care Units of Adults (UCIA). Design: Prospective observational study of transverse cut, made in November of 2002 in Health staff of UCIA from four public Hospitals (Clinical Hospital, National Hospital, Social Preventive Institute and Medical Emergency Center). Variable: age, sex, hospitality labor, and admission, preview surgery, preview use of antibiotics and topics corticoids, nasal carrying of S. aureus and antimicrobial susceptibility. It was made nasal swabs to detect carriage of S. aureus in 142 individuals. The isolations were confirmed as S. aureus based on catalase, coagulas and agglutination test. The susceptibility testing was performed by the Disk diffusion method for methicillin (with 1 ?g oxacilin disc), vancomycin (VAN) in agar Mueller- Hinton. Results were interpreted with guidelines established through the Clinical and Laboratory Standards Institute (CLSI). Results: It was included 142 persons of the UCIA Health-staff. Average age: 32 ± 6.3 years, feminine sex: 78.2% and the distribution by function were: 23.3% doctors, 57.0% nursing and 19.7% assistants. The risk factors of nasal carrying were internment and preview surgery in the last year, in 8.5% and 22.5% respectively; the utilization of systemic antibiotics 46.5% and topics corticoids 11.3%, both were in the last six months. They presented positive culture of S. aureus in 60 people that represent 42.3% of nasal carrying, methicillin-resistant S. aureus was 33.3% and non resistant to VAN was found. Risk factors for nasal carriers for people working less time in an UCIA was of OR 2.76 (1.33 - 35.75) p 0.006 and for S. aureus methicillin resistant (MRSA) nasal carriers working in Social Preventive Institute and National Hospital was of OR: 4.71 (1.4 - 15.8) p 0.01. Conclusions: Nasal carriers of S. aureus healthstaff of UCIA were 42.3%, 33.3% of the strains were methicillin-resistant S. aureus. The lesser spent of time working in an UCIA was a risk factor for S. aureus nasal carriers and for people working in Social Preventive Institute and National Hospital was for MRSA

Keywords : Nasal carriers; methicillin; S. aureus.

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