what is c diff antigen
C. difficile also produces a second toxin that is designated as Toxin B. Toxin B, which has been. referred to as the cytotoxin of the organism, is the toxin detected by tissue culture assay. Toxigenic C. difficile strains. produce both Toxin A and Toxin B, or only Toxin B. The glutamate dehydrogenase (GDH) C. difficile antigen is a good marker for the organism in feces because it is. produced in high amounts by all strains, toxigenic or non-toxigenic.