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Yes, i know he's had the same GP for years and the same treatment. The trouble is, also, the catheter gets blocked with sediment and he bypasses. He is in a lot of pain when that happens. Doesn't complain, but you can see it in his face. That happens always after the infection has been unsuccessfully treated. He is 90 and not too worried about becoming immune to antibiotics in years to come. It's frustrating, because we know what is going to happen, but we're not allowed to prevent it!