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In Latin America, few studies have been done in mupirocin resistance and biofilm formation in methicillin-resistant Staphylococcus aureus (MRSA). This study investigated mupirocin-resistance in MRSA isolates from pediatric patients with bacteremia and their ability to form biofilm. Antibiotic resistance was analyzed with the Kirby-Bauer test and the broth microdilution method. Bacterial biofilm formation was measured using the crystal violet assay. Among MRSA isolates, 2.3 % (5/217) exhibited a high level of mupirocin-resistance with a minimum inhibitory concentration of &gt;512 μg/mL, in addition to cross-resistance with clindamycin, erythromycin, gentamicin, and ciprofloxacin. Remarkably, biofilm formation in such isolates was moderate to high. This is the first report published in Argentina on clinical isolates of mupirocin-resistant MRSA and it is critical for following its evolution over time at a local level and in the Latin American region.

Emerging mupirocin resistance in methicillin-resistant Staphylococcus aureus isolates at a tertiary care children’s hospital in Argentina