I have 13 cats in a 1000 sq ft home. They all interact and get along with each other, share the same food and water bowls. So far only 2 have tested positive and these were hereditary. My vet suggests that I only worry about testing if any of them become extremely sick, otherwise the chances are very slim that they will contract it. Basically, I just keep an eye on everyone's health and only worry a little bit.
Chris
