Re: Cat Flu Advice
I'd say go for it, though keeping him indoors (or in an enclosure outside) is probably a good idea. Our Othello has the feline herpes virus. He's had a couple episodes of eye discharge (treated with antibiotic ointment) and one full-on sneezy, lethargic, stuffy nose episode (treated with oral antibiotics and an L-Lysine amino acid supplement in his food), but he hasn't had a flare-up at all since November, and those earlier issues have each been one quick trip to the vet and some pretty easy home treatment. Our vet told us that, at least here in the U.S., "pretty much all those shelter kitties" have been exposed to the feline herpes/upper respiratory infection virus, kinda like how all the kids at day care share germs. The virus really hasn't been a big deal for us. (And humans can't get the virus from cats, so no worries there.)
ETA: Our vet made that comment because we got two unacquainted cats at once from the same shelter (about 18 months ago), the shelter said Othello might have an upper respiratory infection and we should keep them separated until the vet checks them out, but the vet wasn't too concerned because he figured Desdemona had probably been exposed by that point anyway. Desi's had one course of antibiotic ointment for eye discharge but has otherwise been fine; maybe her immune system is just a little stronger than Othello's. Who knows.