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We thought it was just in the environent or something, instead we were spreading it.

Wow, that sucks - but it is very interesting. I was reading about FIP after reading your post and noticed this:

"Not all cats that are exposed to the FIP coronavirus will develop the disease. In colonies of cats in which this disease is known to be present, estimates are that 8 to 20% of cats exposed to the virus will develop clinical signs of FIP. The rest of the cats may become immune to the disease or may simply not react to it. The reason that only a relatively small number of cats exposed to the virus develop the disease is unclear. It is known that the cell mediated immune response is the primary protection for the cat's body in the case of FIP. Cats that do not have a good cell mediated response may be more susceptible to the disease. The humoral (antibody) defense system actually enhances the damage caused by FIP virus and seems to be partly the culprit in the death of affected cats."

So it is possible that your current cat won't actually show symptoms - not to create any false hope, though.

I thought it was also interesting, though, that FIP is caused by a coronavirus but is also an autoimmune disease - two traits also exhibited by SARS.
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- trs