Thank you Rebecca, it's such a horrible disease to witness and you going through it twice must have been heart wrenching. What precautions did you take to help prevent the Hooligans from possible contamination with the virus? I've been trying to disinfect as best I can but would appreciate your input. xo
Thank you Dawn, it has just been such a physically and emotionally draining time for me I just didn't have the strength to talk about it much. Even now, I feel absolutely drained from it all. Appreciate you all so much as I know my friends understand what it means to lose a beloved fur baby, and such a young boy too! 
Honestly my vet said to wash and vacuum but he said the rest more than likely all ready have the FCoV virus. I think my Katie might have been a carrier but never mutated. I feel now that Freyr is a carrier. You can have the vet do Titer count to see if they are still carrying the FCoV virus. Dr Addie's site is full of information. However she seems to be a big believer in inside/ outside cats. She may not be wrong in her thinking in regards to the virus:
In natural circumstances, cats go outside to defaecate and bury their faeces, in which case the virus lasts hours to days (it survives slightly longer in freezing conditions). However, in domesticating the cat we have introduced litter trays: FCoV may survive for several days and possibly up to 7 weeks in dried up faeces in cat litter. The litter box is your main culprit
From Dr Addies's website:
If your cat uses a litter tray, then make sure it is declumped as often as possible and use dedicated poop scoops for each cat pen or tray. Better still, if possible, let the cat out to go to the toilet naturally outside (I am aware that this is not always possible or desirable where there is a lot of traffic). If you have several cats, make sure that you have enough litter trays, preferably one for each cat, and get covered or even self-cleaning litter trays. Site the litter tray away from food areas so that microscopic faecal particles cannot be blown onto the cat's food. Use a Fuller's Earth based non-tracking cat litter, to minimise spread of microscopic particles around the house. Once or twice a week, clean your litter tray with domestic bleach (sodium hypochlorite). Do stick to bleach disinfectants, as pine based ones are toxic to cats. Vacuum as often as possible to reduce the number of contaminated cat litter particles.
http://www.catvirus.com/PreventionS1.htm#CatLitterI can tell you I panicked everytime they sneezed or wouldn't eat. I have let my guard down, really should put it back up and make sure those litter boxes are done (disinfected) more often. I also feel that since our experience with the litter robot is not what others have had - I need to add back more litter boxes.
I would clean the litter boxes thoroughly weekly, however you know that can become very costly. I had up to 7 litter boxes at one time. Currently once every other month they are being bleached, that is not really enough even though they are scooped daily.
I also will not introduce another cat into the house, as much as I would love a Tortie.
