I would go with rest and the antibiotics for a few days and see what
happens. A high fever can cause a cat to go lame, just from the aching
associated with it. Young kittens sometimes develop "lame kitten
syndrome," which responds very quickly to antibiotics. Even if your
Little Man is no longer a kitten, a high fever would probably have the
same effect on him.

Just my opinion, though; I'm no vet, just a scruffy rescuer with an
excellent and conservative vet. I hope he is better soon.

Sharon Talbert
Friends of Campus Cats