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Back in 2006 when I stated BCG treatments I also had some fears about being infected. My Urologist took the time and explained how the BCG would be instilled only in the bladder and the chances of it getting into the bloodstream were exceptionally low. He said that in all his years of practice he has never had a patient been infected. I had 30 BCG treatments over a 3 year period without getting a TB infection.
All the best, and good luck with your treatments,
Jack