Open breeding kennels, shelters, or cats exposed to other untested cats are prime candidates for vaccination. It will not hurt, but may help to vaccinate untested cats. Healthy indoor cats are not at risk unless they are allowed outdoors. No pet should be outdoors unsupervised without proper restraint. Keep house pets indoors.
Vaccination is no substitute for responsible pet care.
It will not protect the free-ranging cat from the multitude of risks such as autos, humans, other animals, toxins, and other lethal agents. Cats with this disease should be euthanized or isolated from healthy cats. Debilitated pets that have lost appetite, ability to ambulate, or the will to properly groom or eliminate should be humanely euthanized. It is inhumane to let them suffer. My dog is a great dog, when we are home.