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Yes, Marek's exposure can cause immunosuppression. Out of 5 necropsies last year, 4 died of illness from bacteria most chickens are resistant to'
Someone said Marek's is like HIV/Aids. Exactly. HIV is like the exposure. You may never know you have it. With some people the HIV virus weakens the immune system and HIV becomes Aids. That's when people die of ailments that most people have resistance to.
Before I knew my flock had it, I had about 25 chickens. Every few months someone would waste away and die. I had no idea why. The ones that would waste and die were generally under a year old. When I had 10 chicks get paralysis, I knew. Marek's doesn't always show up as paralysis.