The 3M™ Petrifilm™ Staph Express (STX) System consists of a 3M™ Petrifilm™ Staph Express Count (STX) Plate and a 3M™ Petrifilm™ Staph Express (STX) Disk, which are packaged separately. The 3M Petrifilm STX Plate is a sample ready culture medium system which contains a coldwater soluble gelling agent. The chromogenic, modified Baird Parker medium in the plate is selective and differential for Staphylococcus aureus but may also indicate Staphylococcus hyicus (S. hyicus) or Staphylococcus intermedius (S. intermedius). Three Steps Offer Fast and Easy to Interpret Results: 1) Inoculate. 2) Incubate . 3) Interpretate: Review the interpretation guide 3M Petrifilm Plates have demonstrated consistent performance that has been cited globally with more than 200 certificates, recognitions, validations, and peer review publications (Link to validations section)