At this point I wouldn't worry about it. Cook as you normally would with any bird. If it appears diseased leave it where it fell (or bury it). It's not a bad idea to wear rubber gloves anyway. If they happen to have avian flu, you'll either get it or you won't. Short of a bunny suit nothing you wear will likely add significant protection. Just make sure you wash up afterwards. Regardless, avian flu hasn't shown up here yet anyway, and those in Asia getting infected have had constant, daily contact with caged birds. Even if you go dove/quail hunting every day, they're still not caged birds you're dealing with, nor are you going to be exposed to anywhere near the number of birds as those Asian poultry farmers.