You'd think that would be the case so it opens up more questions. There are multiple flyways across the entire United States - so why hasn't it hit every single flyway and in larger numbers? And it's interesting that this public article has finally mentioned that people are arguing with each other over the causes of this, because for a while it was mostly being kept quiet that veterinarians were disputing what the USDA/CDC folks were claiming was the cause.The east coast is a MAJOR fly-way for migratory birds and should have been hit hard if that theory were to hold water. I won't bother with a google search but I think birds come from as far as beyond the Arctic Circle, down through various parts of Canada...
I also posted this in an APA group and the responses so far are that waterfowl ARE the culprit because it happened in flyways, and that backyard flocks did have it but it was just not reported or misdiagnosed. What I am finding when there are conversations like this going on in groups, is that a good number of APA members believe pretty much everything that comes from the government while people who are more interested in the utility uses of poultry tend to not take everything the government says at face value.