Mine had all gotten URI and one started to cough; what my vet told me was as long as everything is clear, keep your cat comfy, hydrated and eating. If any mucus from nose or eyes turns yellow or green, antibiotics are needed. What he didn't say was coughing is a sign of danger and should not be ignored-one of mine started to cough but wasn't producing anything for a few days until sudddenly he coughed up a huge gob of phlegm; he had pneumonia. Happily we were abie to save him. The nurse said 'oh yes-coughing is never a good sign in a cat unless it's just a hairball!" So I repeat this story frequently so people know-had I had that info days earlier Bob wouldn't have suffered and nearly died. This is the best info I can give you from my personal experience. I wanted to elaborate on Tigermiller's unfortunately correct answer. Best of luck to you, maybe it's just allergies; mine have had them this spring and do keep us posted!!
Acutaly im sorry to say know... BUT if its left untreated can amd very may kill your beloved cat...
hi jake...sorry abt your poor kitty. unfortunately unless this virus turns bacterial theres not much a Vet can do anyway. a fairly healthy kitty can recover from a bout within a few days but one with weakened immune systems it can turn fatal very quickly. the most important thing you can do is support the immune function. the best 2 supplements for this are L-lysine and Lactoferrin. if you reply I will give you the best brands to buy for use with cats(thse are human supplements).
and to help wiht the sneezing stinging nettles is excellent, again a human supplement. I will send you the safest brand names for cats.
do you have a good vitamin supply store nearby? and if I copy out all the brand names are yu willing to purchase these?
to help with his watery eyes...soak a gauze or cotton ball in warm water and gently wipe his eyes...
let me know if you want the other info.