oh dear. we had a lovely tonkinese kitten in last week with horrible runs since it was a little one. we ended up trying steroids(prednisolone) daily and after a week the runs were back to solid. i have no idea if this would be suitable for the kittens but might be a suggestion for the vets to try. we sent off samples to Axiom with no results and this was the next route thinking it might be IBD/IBS. I hope the little ones get better soon!