The American Veterinary Medical Association said symptoms to watch for include a staggering gait, the inability to retract claws, extreme sensitivity to touch, tremors, and seizures. The illness usually lasts for a few days to a few weeks, but can also linger for more than a year.
I am aware of how damaging cats are to the ecosystem, but regardless of that, I don’t understand how you can live every day worrying whether the cat will come back or bring some kind of disease home with it. With our indoor cats I have control over what they eat and at most every few years they catch a cold. But nothing serious after 9 years of having indoor cats.