Same here Feral. 'Bitz is a herpes kitty and the Lysine will help as you and another poster suggested. I'm glad this situation looks like it is going to have a good resolution.If your kitty had an already compromised immune system or has the Herpes virus. - then the vaccine would have had negative effects on the immune system. I have a herpes kitty too, and will never again give her any vaccines. The Lysine will help your kitty.