Testi za določanje proti meticilinu odporne bakterije Staphylococcus aureus = Tests for detection of methicilin-resistant Staphylococcus aureus
Tomič, Viktorija
Background: For successful treatment of staphylococcal infections, it is very important to determine resistance to methicillin very early in the course of treatment, since in clinical terms it means ...resistance to all beta-lactam antibiotics. Methicillin-resistant S. aureus (MRSA) is well established as an infection control problem in hospitals and long-term care facilities all over the world. For appropriate treatment of MRSA infections and to prevent spreading of MRSA in health-care facilities, early and reliable laboratory detection of MRSA is of utmost importance. False identification of bacterial strains and/or false determination of resistance to methicillin can have serious clinical, epidemiological as well as financial consequences. The aim of our study was to find the combination of tests that would provide reliability, shortest possible time to end result, and affordability in terms of the costs of each test employed in routine MRSA detection. Materials and methods: In this study, 7 different tests for identification of S. aureus and 6 different tests for determination of methicillin resistance were compared. 197 randomly selected staphylococcal isolates (45 methicillin-sensitive S. aureus, 100 MRSA and 52 coagulase-negative staphylococci) and 3 control strains were tested. Results: The sensitivity of our bacterial identification tests was 90% to 100%, and their specificity was 90% to 100%. The sensitivity of our tests for determining methicillin resistance was 94% to 100%, and theirspecificity was 90.8% to 100%. Conclusion: A combination of Oxacillin Resistance Screening Agar Base (ORSAB) plates, Pastorex Staph Plus latex agglutination test, free coagulase test and oxacillin salt screening plate enabled reliable and cost-effective determination of MRSA isolates.
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