Sounds like one heck of a URI. They are contagious, but in the years I've had fosters, not one of my guys caught the URI from any sick fosters. It has to do with how healthy their immune systems are before they come in contact with the virus. Some kittens are just so young and haven't developed a strong immune system yet that the URI will run a long time.

I had a few fosters who just sneezed and coughed for weeks, despite multiple doses of antibiotics. Pouncer seems to be one cat where the typical "10 day" prescription doesn't cut it; every time he needs an antibiotic he gets it for 20 days because of his immune system.

I've also learned to try different antibiotics. If Clavimox doesn't work, try Baytril. If Baytril doesn't work, try something else. A lot of vets don't like to prescribe antibiotics for URIs because they feel they just need to run their course. In the meantime we're frantic over our snotty little kitten who is miserable.

ALSO, Allen can't take antibiotics - they make him sicker than before (must be an allergy) so when he gets sick, I seriously have to be patient and let it run its course. Allen becomes vomit boy whenever I give out any type of antibiotic (the question in my mind is always this: is it easier to clean up lots-o-vomit or cat pee whenever he has a urinary infection )