Is C. DIFF CHEK™ different from toxin ELISAs?
Yes. C. DIFF CHEK™ is more similar to culture in that it detects the presence of the organism rather than detecting the toxins. The toxin ELISAs detect Toxin A and/or Toxin B of C. difficile. Because about 20% of C. difficile isolates do not express the toxins, and all C. difficile express glutamate dehydrogenase at high levels, you will get samples that are positive in the C. DIFF CHEK™ but negative in ELISAs for the toxins.