You might want to discuss with your oncologist what to be alert to with regard to immunity. I am beginning to track down one item now. I was given a script and sample packs by an ophthalmologist of an eye drop that is an immunosuppressive agent. Thankfully I did not fill the expensive script until I saw if the sample packs of drops help. Now to check with my oncologist if they do help with "dry eye". I had come across a study that the life expectancy if someone with CLL gets an eye infection is measured in months.