BioMerieux is recalling the VITEK 2 Gram Positive Cefoxitin Screen and VITEK 2 Gram Positive AST for Oxacillin because of false negative or false susceptible, respectively, results for some strains of methicillin-resistant Staphylococcus aureus (MRSA). Gram Positive AST Cards are reagent cards used with the BioMerieux VITEK 2 and VITEK 2 Compact Systems to identify and conduct antimicrobial susceptibility testing (AST) of bacteria and yeast, which helps determine an effective antibiotic treatment for patients with a bacterial infection. BioMerieux manufactures 68 separate AST cards for the VITEK 2 Systems which contain oxacillin and cefoxitin. Read the FDA safety alert.