Proven cost effective tool for the detection of Staphylococcus aureus.Final results between 1 to 3 hours.Unique system to facilitate the enumation of S. aereus. Utilizes the convenience and efficiency of the 3M Petrifilm Plate platform. 3M Petrifilm Staph Express Disks have to be used to distinguish Staphylococcus aureus from all suspect colonies. Used when background flora exists in your staph testing. This disk is used to identify Staph aureus from all suspect colonies.