Candida is what normally causes the UTI during the infestation, not necessarily the detox or cleanse.
Read this post from Janice which she made on August 18, 2010.
“I first became aware of my candida issue after getting on antibiotics over and over again (the worst thing I unknowingly did) to rid myself of chronic (sometimes twice monthly) urinary tract infections. They were generally coupled with yeast infections. I consumed enough cranberries to keep the industry in business and was religious about my regimen of cleanliness. And still they came. I found that several sites listed UTI’s as a common symptom of excess candida in the body. I have not had a single UTI since I’ve embarked on this diet! YAY! I was just wondering if anyone knew how or had any idea why candida affects the urinary tract. Thanks!”
Cranberry capsules can help to prevent a UTI.