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>Andrew Read from Pennsylvania State University thinks that the vaccines were responsible. The Marek’s vaccine is “imperfect” or “leaky.” That is, it protects chickens from developing disease, but doesn’t stop them from becoming infected or from spreading the virus. Inadvertently, this made it easier for the most virulent strains to survive. Such strains would normally kill their hosts so quickly that they’d die out. But in an immunised flock, they can persist because their lethal nature has been neutered. That’s not a problem for vaccinated individuals. But unvaccinated birds are now in serious trouble.

Yeah... Covid19 vaccines come to mind...

>>Andrew Read from Pennsylvania State University thinks that the vaccines were responsible. The Marek’s vaccine is “imperfect” or “leaky.” That is, it protects chickens from developing disease, but **doesn’t stop them from becoming infected** or from spreading the virus. Inadvertently, this made it easier for the most virulent strains to survive. Such strains would normally kill their hosts so quickly that they’d die out. But in an immunised flock, they can persist because their lethal nature has been neutered. That’s not a problem for vaccinated individuals. But unvaccinated birds are now in serious trouble. Yeah... Covid19 vaccines come to mind...

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Yes. I used to have chickens I bought from a hatchery vaccinated for marek’s disease. (We no longer purchase from hatcheries, we hatch our own). We are a “closed” system. No outside birds enter our compound, as only 12 of 30 chickens have been vaxed. It would wipe out a lot of hens. I think the difference is that the Covid vaxed people are going to die before I do. And I won’t shed a single tear. I’ll actually let out a sigh of relief.