The vet prescribes antibiotics, say,
Clavamox (
Amoxicillin) If that doesn’t work, then your vet prescribes another antibiotic. I was hoping, while I was reading your post, that you would tell us that the only symptom was sneezing. For your kitty’s URI, you need to go back to the vet see if they can give you something else. If ‘something else’ does not work, then it can potentially be a virus. Viruses do not go away with antibiotics.