Brought a stray cat into the house with my other (12) cats. He was taken to the vet and tested positive for feline leukemia and we had him put down. My other cats have all been vaccinated and are healthy. How long should I wait to take the other cats to the vet to be tested? Every time I hear one of them sneeze now I panic. I have disinfected and thrown away things that could not be washed that the stray cat came in contact with. The stray lived with us for about 3 months and he seemed very healthy. No signs of illness at all. His test results were a shock to us. I am very paranoid about my other cats right now.