David
My friend the epidemiologist (the one that put the Australian submission together for vaccine for boys) suggested that Alex and I should both have the vaccine - his reasoning being that if Alex couldn't clear it by himself he would not have antibodies. He told me that he had some anecdotal evidence that the vaccine might have some effect on decreasing the incidence of dysplasia in older women (cervical) which applies the same thinking.

When I asked Alex's radiation oncologist about it, he looked confused and said, "that would be a bit like shutting the gate after the horse has bolted wouldn't it?"

I must admit, I lean more towards the epidemiologists thinking but have no scientific reason for thinking that...