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for some reason this did not post in the right place - this was a reply to the post about leukosis...

I read up on this and some of the terms used in the article, and I think this would explain it in the case of young chicks, but not necessarily hens. If you look up Bursa of Fabricius, it is an organ that is present and active in chicks and helps build their immune system. But it dwindles away...