The bit I Found informative on the link above is that breeders could consider ( myself included) all thess points :
1. Do not vaccinate for FIP unless all your titered cats have negative results, as there is a chance you may be enhancing your cat's susceptibility to the disease, rather than protecting it.
2. Don't euthanize all your cats if you suspect an FIP outbreak. Be aware that FIP strikes the weakest, and not all of your cats will develop classic FIP.
3. Reduce stress in your animals - stress impairs the immune system and healthy cats resist disease better.
4. Spay and neuter your cats so you do not have overcrowding and inbreeding. It also keeps your cats healthier in general.
5. Practice cleanliness; the major risk factors for FIP include poor sanitation, overcrowding and malnutrition. The disease is spread by faeces, ingestion and sneezing.
6. Think before you decide to vaccinate kittens for leukemia. Have them tested, the vaccine challenges the immune system.
I personally don't think it's healthy having lots of breeding cats mixing together in 1 house hold and not to mention sharing litter trays
It's much healthier for cats to be in groups of no more than 2-3. Also less stressful for them as some like there own space and some are very dominent.
I don't think I'd want to vaccinate against FIP....Now there's something we could ask everyone on here