I am sorry to hear about your sweet cat, Cliff. How old is he?
Ask your vet about Interferon for treatment. Some cats have had a good response to it.http://www.geocities.com/Heartland/P...nterferon.htmlhttp://www.catclinic.co.uk/therapy/interferon.htm
I too have 3 positive FIPV cats diagonsed last December. All seem healthy except for a few scares recently which seem to be an overreaction on my part. Dealing with this disease, you too will experience this also unfortunately. You just have to keep a better eye on them regarding their health. Keep a journal if you have to if you notice something that isn't right.
All I can tell you right now is to make sure you keep the litter boxes and bowls constantly clean (daily). This is very important if you do not want the others to become just as ill. I would not separate them from Cliff as they have already been exposed to the virus. Each cat is different on how the virus will effect their body, just make sure you provide a healthy enviroment.
Try switching over to a healtier diet for them (Hill's Science Diet Nature's Best is what I use now), it has vitamins and minerals that normal local store brands do not have and will help keep your cat's immune system stong. Or you could even give them vitamin suppliments if you wish. It's worth a shot to try and keep them as healthy as possible when they have been exposed to a virus.
Try these support groups, they really have helped me understand this disease and clear up any myths I have heard about the corona virus and wet/dry FIP.http://groups.yahoo.com/group/FIP/http://groups.yahoo.com/group/FIPCatSupport/http://groups.yahoo.com/group/FIPsupport-group/
Can you believe some people have actually put their cats down because their uneducated vets told them that their cat had FIP and would die, when it turned out they only were the carriers of the virus with no visable health problems? This is why you need to have an experienced vet when it comes to FIP, get second opinions if you have too. This is also important when dealing with FIP, most vets do not know enough about it. I too, had to turn to the internet for more information, my vet basically said after I got my strays tested that "They have FIP, sorry". I had a million of questions to ask and all she could tell me is that there is "no cure and it is fatal". Which is true in most cases with tests that come back with a higher titer, but she had no way of knowing if this would happen to my cats or not. She had no advice and basically sent me on my way. I cried the rest of the day at work because I thought my cats were dying right then and there.
Just make sure you have an understanding vet, is all I'm trying to say. False tests do indeed occur. Some recommend getting them tested every six months if you got them tested when they were young because their immune system would have changed with them getting older.
I'm not getting mine tested again unless I see a decline in their health. That is also my suggestion to you also.
Good luck, and I hope Cliff,Elvis and Bob stay well!