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80% of the chicken population is estimated to carry Marek's virus. It's impossible to avoid without keeping chickens in a strict quarantine fortress all the time- and ironically I believe it's these isolation practices that get chickens sick and killed in the first place Chickens with high...

I have a large organic flock that lives outside 24/7. Over the years I've had a few chickens here that were vaccinated and so far those are the only chickens I've ever had that caught sudden paralysis and death. I assume the vaccine interfered with the proper functioning of their immune system...