You also have to remember that is a free program and to test for PT they poke them and get some blood to do the sample right there. The AI is a simple swab. Other diseases require blood samples that need to have lab work done and then your getting into a more costly process. Plus some of the other diseases you mentioned and not nearly as devastating and have a cure, even tho they are carriers, while the ones they test for have no cure and are a guaranteed death sentence. When they offer free services, it’s a small step in the right direction that more people will partake in. If I have to pay lab work on 75 plus chickens, I would not even try to participate. NPIP isn’t a miracle, but it does help in some ways.