I am in the process of testing 12 cats after one became ill and tested positive with feline leukemia. Vet recommended euthanasia as after 2 rounds of antibiotics cat continued to hide under bed and not eat. The first 2 cats were negative and were vaccinated, the third tested positive yesterday and the vet presented the option of seeing if most of them test positive to let them be and continue to live and eat together and then I suppose to euthanized them as they get ill. None of the other cats appear ill but I don't know what to do. Two cats go out as one is a feral I let in during the snowy winter and one was an outdoor cat I adopted when the owner moved and he goes out to do his business and on occasion the others sneak out when door opened for these two. I have 2 going to vet today to be tested and 2 more on Friday. There is no way to separate them so what should I do? Thank you.