Résumé : Staphylococcus aureus represents 18,5 % of isolated strains from post operative wounds infections and previous deductions from the hospital surrounding. In this survey, it is the most frequent organism. It has been isolated 34 times alone, 80 times associated to others. 22 % of isolated S aureus are Methicilline resistant. 31 different bacteriophage types have been determined. Among them the type 3A/3C/55/71 is the most frequent which is the base of the observed hospital epidemy. © 1994.