I have a 2-week-old kit who has survived over 24 (probably more like 40-48) hours with diarrhea. At first I just thought it had peed on itself, but now it's clear, jellylike, foul-smelling diarrhea. The kit has no interest whatsoever in nursing. I made a solution of water, sugar, and salt (according to a recipe I found) and it has been drinking just a little of that. I am encouraged that it is making a little effort to keep its face and front paws groomed. I've found lots of articles about just-weaned kits with diarrhea, but what about kits in the nestbox?