We adopted an 8 week old kitten who had a URI and unfortunately it spread to our 1.5 year old cat. Both got on anti-biotics have seen the vet and are on lysine. The kitten seems to be 100% better, but the older one although he seems better is eating normally he still sneezes a lot of snot and you can tell he is stuffed up. I feel bad keeping them separate they just wait on the other sides of the door trying to be together. When is it safe to let them be together, without the risk of the same virus getting passed back to the kitten? P.S. sorry if this is a silly question this is my first experience with sick babies.