Recently read that one risk factor for getting recurrent C.Diff. infection is impaired colonic resistance from bowel evac
preparation for
colonoscopy test. The good-bad bacteria balance in people prone to C.Diff. infection gets out of wack from the prep, just like it can by taking certain antibiotics.
Had C.Diff. and couple of rounds of treatment (Oct. 2008-Jan. 2009), and my Mom had it from Aug. 2008-April 2009), but never heard about this before.