Danielle, I remember you from when you joined us. I am so sorry he didn't get well. Will you get a report on the exact cause of his death? I hope so, in order to not bring another bird into your home with a possible virus in the house. There are a few viruses that live for a long time in the dust that hides in corners and behind furniture. Very hard to get it all cleaned out.
I have Diana, a Vosmaeri, who is 9 years old and plucked naked except for wings and tail.
She was very ill as a youngster with zinc poisoning and then got Pacheco's virus. My vet couldn't believe we saved her. Took lots of time, lots of medicine and lots of TLC but she's been in remission for about 4 or 5 years. She has plucked ever since the zinc poisoning. She has permanent intestinal damage from it.
I don't know if they are more fragile than other species. I had another bird, a conure, who died of Pacheco's after Diana was much improved from hers. I suspect that Patti, the conure, may have been a carrier of Pacheco's. She didn't get sick til after an injury and went downhill very quickly. Conures are known to be carriers of Pacheco's. Not all of them, of course, just some.
Annie