An FDA study was released in 2018 showing that colonoscopes are 100 times more infectious than previously thought, mostly because they are improperly cleaned. Here is the WebMD article talking about it:
Despite the findings, the FDA decided to keep recommending colonoscopies because they have no better imaging method for diagnosing disease.
There's also this study, which shows 1 in 8 UC patients flare after a scope:
I'm one of those 1 in 8. Every time I get scoped I have a fulminant flare. Every. Bloody. Time. I don't get colonoscopies anymore. Which is fine because I'm in remission anyway.
Wow, that's some scary stuff. Scopes have made me flare as well. I'm glad that my new GI so far seems less eager to jump to scoping me every time I flare than some of my previous doctors did.
35 years old; diagnosed UC March 2007 (prob. pancolitis; couldn't get scope all the way thru).
9-29-16: chronic and active proctosigmoiditis (infectious cause). Battled reoccuring campylobacter & c diff. Oct-Dec 2016. Remission since Dec. 25, 2016 until I started smoking again May 2018 after 9 yrs quit. Re-quit 5/10/19.Maintenance: Delzicol, 6, 2xday; Rowasa nightly. 6/5/19: 30 mg pred & tapering