I have seen at least one bird with these symptoms, more than 12 years ago — i found a shivering blind bird, but I couldn’t do anything to help it at the time (wage enslavement.)
If it’s connected, then this pandemic has been slowly & silently brewing for decades.
Archive link - https://archive.is/1XMgX
I was in a small rural town, a friend told me not to let my dog interact with other dogs on the streets, as there is an unknown illness causing brain swelling in dogs. The government is ignoring it and despite everyone locally aware noone else is and vets near there dont know how to solve it or of any medicine can help.