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.
The added benefit is that when there are few enough cats that there are loving homes for most of them, then the percentage of kitties with humans to take care of them increases drastically.