Hi, Dan, in Dr. Visca's study, some of the patients with Pseudomonas no longer cultured it after being on GSH for 4-6 months. There was no patient who began culturing PA while on GSH during that 4-6 month period. Theoretically, though, PA could use GSH to protect itself, as I mentioned in an earlier post. But Dr. Visca's study showed the opposite. It will be interesting to see what his new study, beginning in June, will show!