Does anyone have solid information on the incubation and development of visceral Mareks? I know there are several forms of Mareks and various presentations, but I was told visceral Mareks takes much longer to manifest. A vaccinated hen was purchased from a well known breeder and died 4 months later of visceral Mareks. I’ve never dealt with Mareks or ALV and all deaths in my many many years of ownership have been necropsy confirmed. The university and my vet said the hen was 100% infected at a young age before purchase and they suspect improper vaccination/improper quarantine before immunity. I’m still trying to find concrete information that supports this. I’m still assessing the damage…. Some of my newer ones weren’t vaccinated because the other breeder didn’t vaccinate. I only had new NPIP birds and newly hatched ones and I wrongly assumed NPIP tested for Mareks and AVL. I now know that is not correct.
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