Weird, huh? Apparently it's kind of like our general herpes, where most of the population carries it, but only some get really affected by it. I thought he had a lung infection or something, but from reading, it just kind of causes like allergy symptoms, like the drooling and sneezing a lot which he used to do, but doesn't. I think we had him on L-Lyseine for awhile or something, but it doesn't seem to really bother him. Once we got him fixed he calmed down a lot too, which I think helps. He's my big giant baby. He's way more friendly and needy than most of our indoor cats.