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.