My sister's cat was bitten by a snake, it didn't show any signs of being sick for a couple of days and they had no idea until it was too late . Apparently cats can last quite a while before they get sick and some cats don't even need anitvenom at all.

I'm glad you got to it early and I hope your cat makes a quick recovery. Poor little thing.

Perhaps it might be a good idea to get someone out to see if they can find the snake, if it was young there might be more around.