honestly don't panic, I had two brothers both with calici and was in the process of buying a bengal kitten, I spoke to my vet first and he said "how do you know she hasn't got it already" basically his take was that about 70% of cats are carriers not all will ever display any symptoms at all so you would never even know - my boy Oscar (his brother was killed in a rta) is a sensitive soul, any vet visit causes him stress and he withdraws into himself, vaccinations (even program which is for fleas) caused him to become withdrawn and depressed so my vet agreed we don't take him unless we really have to and don't get him vaccinated - he has been happy and healthy for five years since this - I also have a very good friend who's cat had a horrible flare up with the leg syndrome and we really all thought she would die but she didn't and that was at least 7 years ago and she shares her home with another cat happily - please don't worry, if you can get your cat well you may never have to think of it again