I'm very familiar with this problem. It's a significant part of my work right now.
The current strain of HPAI (highly pathogenic avian influenza) aka bird flu has affected more than just domesticated poultry. We've found it in dairy cattle, wild birds, and other mammals. Cats seem particularly susceptible to it.
The reason it's so deadly to domesticated poultry is because of how they are raised - in tight quarters by the thousands, indoors. So the spread is like wildfire. If a flock of layers, broilers, or turkeys gets it, they have to be euthanized. Then the barn has to be cleared out, cleaned, sanitized, and sit empty for 30 days to clear the virus. Then you have to line up a new flock which takes time and is in high demand right now. For laying chickens, it also takes time for them to reach adequate egg laying age.
Flock after flock is being taken out across certain parts of the country. That's why eggs continue to go up, if you can find them. This problem is not going away either. A new strain was just found the other day. California has declared a state of emergency with their dairy herds because it's so prevalent. It's not fatal in dairy cattle, but it reduces their milk production.
Luckily, it hasn't mutated or been shown to spread from person to person yet, and cases in people are still rare, although they are rising. If it mutates to the point where it can more easily spread from person to person, get ready for pandemic 2.0.
This problem isn't going away on its own. Egg prices will probably continue to go up. Commercial poultry operations have implemented very strict biosecurity rules to try and mitigate the problem, but it's still happening. I really feel bad for that business. Imagine having to euthanize flock after flock of birds because of this. It would be so devastating. It's their livelihood on the line.
I don't mean to terrorize anyone here about it with post. I just want people to be more aware of this.