Oh, Rose, I'm so sorry and I can understand who worried you must be now.

My Aysche had the wet form of FIP, and when she has reached her final stage, there was nothing else left but putting her to sleep to make an end to her suffering... it's been so sad.

I can understand you're fearing for your other cats now, but they don't necessarily have to have it! FIP breaks out when the harmless form of the corona virus (which many cats have) mutates into the form that causes FIP. This happens when the cat is exposed to stress or the immune system has broken down due to other diseases such as FeLV. Unfortunately, the tests for FIP are not very reliable since they only show up if there was an infection with a corona-virus or not. They won't tell you if it's the FIP-corona-virus or just another one. (They're easily mutating, one form of them is suspected to cause SARS in humans btw, but not one that is coming from felines, so don't worry about that).

Here's some info on FIP:
http://www.newmanveterinary.com/fip.html
http://www.moggies.co.uk/articles/fip.html
http://www.lbah.com/Feline/FIP.html

Kirsten