I'm looking at the new version of the Snomed dictionary and the concept 707993000 Clostridium difficile toxin A + B (substance) is deactivated (and outdated) since version 20170731. Can anybody explain me, why this happened?

We have used this concept for coding of results of laboratory examinations in our software system. Is there an alternative Snomed concept usable for the purpose of coding of evidence of the Clostridium difficile toxin A + B ?

  • 1
    It seems like the Biology SE community would be a better fit, as this really doesn't ask about C. diff's effect on human health.
    – BillDOe
    Sep 13, 2018 at 19:23
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    Actually, this is more of a professional question for other medical professionals, but we have very few of them at this time on this site. I haven't examined SNOMED for C diff but have found a pattern in other changes that they have frequently eliminated grouping-type categories (e.g. toxin A&B) and created individual categories. (This is an observation, not a firm answer, so not worthy of adding it as an answer below. If I discover something more concrete I will write as an answer.)
    – DoctorWhom
    Sep 14, 2018 at 14:35
  • And welcome @dedek! We're in the process of redesigning our site to be more focused towards medical professionals. Check out our meta in the meanwhile!
    – DoctorWhom
    Sep 14, 2018 at 14:36
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    Thanks @DoctorWhom you are probably right, I found this note in 20170731 release notes : Concepts containing disjunctives were inactivated . I also saw elsewhere that disjunctive aggregates in concepts are not acceptable...
    – dedek
    Sep 17, 2018 at 12:59


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