Emergence of vancomycin-intermediate and -resistant Staphylococcus aureus among methicillin-resistant S. aureus isolated from clinical specimens in the northwest of Iran

This study highlights the presence of MRSA along with VISA and VRSA in our setting. To our knowledge, this is the first report showing that a strain can be defined as VISA phenotypically and as VRSA by molecular analysis. Such a finding raises major concerns with regard to control measures and reliable laboratory tests for screening of resistant strains.