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Ooops, sorry, I misinterpreted the abbreviation and feel stupid now. The o.p. should ignore my previous post Pat

(edited to say -- I believe I misinterpreted things, as per Ridgerunner's post below. So, I'm not going to delete this post, but just ignore it, k? ) If your hens' Mareks was bad enough to be seriously affecting their health, it is possible that it was of a more-serious strain (although it is...