SV Dad
Savannah Super Cat
For what it's worth and I've mentioned this before, it could be something as simple as the cat litter. That stuff is dusty, can clog sinuses, and cause infections. And they keep coming back. I had a poor cat suffer for years before we discovered it. In my case, it was cheap kitty litter not made in the USA. Sneezing can be more than an infection. It can be histamine mediated, and that points to allergies.