C. diff or C diff or C. difficile?

C. diff   or   C diff  or  C. difficile  -  how should it be transcribed?

"C diff" is considered slang and should not be transcribed as such in transcribed reports, except for STRICTLY verbatim accounts.

Per Ask Dr. Stedman, the preferred and correct way to transcribe "C diff" is to transcribe it as "C. difficile" or go for the complete expansion "Clostridium difficile."