Lisa, I finally got a reply from my vet and she said that orophargyneal disease is not a diagnosis but just a description and there are many types and severities. She said that if you have any doubts about your current vet then you may want to see an internal medicine specialist.

I just hope that whatever it is can be properly diagnosed and treated and that no more of your cats will become infected. I'll continue to keep everyone in my thoughts and prayers.