To clarify things for you Nostra....UC can be "cured" when the colon/rectom are removed, with CD, having the colon/rectom removed is not a "cure" since with CD it can affect any part of your GI tract from mouth to anus...if you have CD, then expect the CD to re-appear at some point somewhere in your GI tract (that wasn't removed), if you have UC, then because UC is limited to the colon/rectom, having those removed means UC can not come back.
Your experiance (with being disease free due to surgery) does not confirm that CD is infectious....neither is UC.
:)