There is a stray in my mother’s neighborhood that has become very friendly. He is neutered is probably a former pet. He has been living homeless for quite some time though. My mother has been feeding him & his brother for over a year. His brother recently disappeared, so we are thinking about taking him in. Our only concern is for the cat we already have in our home. Our cat is an indoor-only cat and is free of diseases like FeLV, etc. How can we be sure that the stray cat does not transfer any diseases to our current pet? If we take the stray to a vet to have him tested are the results 100% accurate? Is there an incubation period wherein the test may show up negative, but the cat may actually have recently contracted a disease and the test just cannot detect it yet? If so, how long would we need to wait before testing him again to be certain the stray is disease/parasite free? Any advice would be greatly appreciated. We’d love to take the stray in, but we are obsessed with our cat and couldn’t forgive ourselves if he contracted some kind of sickness from the stray….