Yeah, but it could take several generations of chickens until “resistant” evolves into being immune enough to not lose half the flock every time. And in the mean time since human farmers will have to be tending to the chickens in some way, there always a risk of the virus jumping to humans.

7th grade science test question: What would evolve faster, a virus that can create millions of new copies every day, or a chicken.

Apparently RFK jr thinks the chickens will evolve immunity faster than the virus can evolve to jump to humans.