We do have H5N1 here, just like everyone else it's out there with wild birds and those fly all over the place, it's been a thing for two decades. Difference being we have regulations and also industrial structure (not as large companies/flocks) which means even if a flock gets infected it's a much more limited loss.

And of course the completely different hygiene standards: Eggs in the EU must be sold unwashed, which means that companies actually have to keep the barns clean. It's similar with chicken meat: It's not like chlorinating chicken would be a health danger to humans, it's that the hygiene conditions that would make chlorinating necessary, seen from the other side that chlorinating enables, are absolutely unconscionable. That's why chlorinating is outlawed in the EU.

In another line of thought, though, we should have another class of eggs: Organic barn. The usual better feed, more space etc. but keep them inside, it's not like chickens mind being inside. Vaccinating them sadly isn't an option at this point, like it is with salmonella.

EU has sustainable practices, robust regulations, and way less idiots in power. There is a lot of idiots, but the way regulation works, it's harder for them to fuckup. Not impossible, but harder.
Good chances that chicken plague is already here, but is dealt with appropriately and doesn't have this devastating results.
Also, no measles.

No they are a symptom of a deregulated industry that can raise prices by 100% even though their costs have only gone up 2%, as long as a convenient excuse is pushed by the industry-aligned media.

Then, when the chicken plague is over, they lower the prices a tiny bit, to about 80% more than before, Trump declares victory, and the rich have become richer again.

You realize Canada doesn’t have this issue, right? And they share a literal land border with the US. Why are you assuming the bird flu is some inevitable force that can’t be stopped?