I don't know why you wouldn't get it, especially since you are post-tx (assuming you tx docs said it was ok). Like Caitlin said, I remember it hurting more than I would have expected but otherwise no reactions. I got the shot because there is so much HPV out there (both high-risk for cancer and other strains) and it would be stupid of me to open myself up to cancer and other diseases when I don't have to. Granted, it normally resolves on its own, but if it doesn't, the treatments are fairly invasive. I had one abnormal pap and had to get a biopsy. If it had revealed a high-risk strain, at a minimum they would have had to freeze off the affected parts of my cervix and more likely I would have parts of the cervix removed. My cousin had to have that done and she said it was very painful and made her pregnancy a few years later high-risk. Just given that you already have a suppressed immune system that a) puts you at risk for infection b) would let that infection more easily progress to cancer and c) would suggest that you should avoid getting things like biopsies and surgical procedures that open you up to further infection, I would just get the vaccine.