Studying the Distribution of Accessory Gene Regulator (Agr) Quorum Sensing System and the Prevalence of Linezolid and Mupirocin Resistance in Biofilm Producer/Non Producer Staphylococcus Aureus in Sohag University Hospitals

"Disc diffusion method using modified Kirby-Bauer technique on Muller Hinton agar (MHA) will be carried out for antimicrobial susceptibility of S. aureus isolates. The following antibiotics will be tested: cefoxitin (30 µg ), Tetracyclin 30 µg (TE), Chloramphenicol 30 µg (C), Gentamycin 10µg (CN), Erythromycin 15µg(E),Clindamycin 2 µg (DA), Ciprofloxacin 5 µg (CIP), Trimethoprim/sulphamethoxazole 1.25/23.75 µg (SXT), Rifampin 5µg (RA), Linezolide 30µg (LZD); cefoxitin disc (FOX 30 g)~zone diameters interpretation will be done according to Clinical and Laboratory Standard Institute (CLSI 2018),"