I can tell you from experience and from advice from Mr.Dawg, the advice he is giving you is spot on. I totally agree that if there is any respiratory conditions that are inherent in your birds, a little bit of stress is sure to bring it out. In my case, very expensive birds were sent thru the post and obviously that is stressful. And sure enough, shortly upon arriving they developed the sneezing,coughing, running nose. I tried everything. I injected them as prescribed by Dawg with Tylon. That was about 4 or 5 weeks ago. They are still having respiratory problems. I have resigned myself to know it is not going to go away. One bird did die from being unable to breathe.
I am beginning to wonder if there is one single bird out there that does not have some sort of respiratory condition hiding under their wing.
I have bird from different parts of the country and I have been diligent about keeping them separated and hand washing and blah blah blah.
Even birds from 5 month ago, 6 months ago, from Ohio, from Washington state, from planet Venus, can cough and sneeze for a period of time. None of those have died. They eventually recover. But like Dawg states...they are carriers.
Yes, as Dawg suggests, to eliminate the whole problem, kill them all. Or should I use the other word, Cull.
Some people have no problem with that process. Sadly, I just can't bring myself to kill my pets.
Please listen to Dawg's advice. In my opinion, he is better than by Avian Vet.