They probably only remove sick birds instead of culling the entire flock. I read on a home flock board that the actual death rate is 20%, but then you have 80% survivors with resistance.
Stupid USDA first created the problem and then magnified it with wholesale flock culling. Another government agency that needs to be gutted.
Better response than previous one
They had an outbreak in 2024, their past vaccines are not effective on H5N2 and as veterinarians have discovered, mass vaxx with a leaky or ineffective vaxx just promotes mutation ( Mareks chickens)
Wonder if they are using the same PCR test and if so, not slaughtering the entire flock
https://microbe-investigations.com/bird-flu-in-mexico-current-situation/