Aorry to bring this up again, but I've found that you don't lose attribute points randomly form being bitten by the vampire. I tried it three times in a row and lost the same seven points each time:
  • 4 Strength
  • 2 Agility
  • 1 Inteligence
  • 0 Constitution

I think it is pobably related to your Constitution, as I have a Constitution of 12 (even though I'm level 18!).

Come to think of it, has anyone lost Constitution to the vampire?