It makes sense to me also Superchemicalgirl and Beer can. Breeding for resistance from what the doctor implied is at best a crap shoot. Maybe hatchery birds have less resistance bred into them but with the vaccine that gives them the edge? Idunno. If as a breed, Fayoumi's are as one article I read about them "Remarkably" resistant to Marek's it may just be a genetic trait in them. They are described as being one step away from feral, an independent breed of chickens that marches to the beat of it's own drummer, more or less. Traits that are probably genetic in their occurrence. I know I read of several studies that are underway where they are cross breeding Fayoumis with other standard breed chickens to see if they can pass on the resistance to Marek's and other diseases. It would make sense that these birds, give their habitat and personalities would if they are closely resembling jungle fowl, would have resistance bred into them as a part of natural selection and survival. A species is not going to survive in the wild if it is susceptible to every disease bug out there.
Superchemicalgirl, as a pharmacist, why don't you think the standard anti viral medicines used to combat common Herpes viruses that plague humans don't work with Marek's? Have you ever seen anything that mentioned using drugs like acyclovir, and in the case of ocular herpes infections, viroptic or gancyclovir to knock the virus back or out before it can progress to the point that it becomes basically malignant in a chicken? Is there that much difference between the avian form of herpes and the human form that the human anti-virals will not be effective on the avian form or has there been any testing done?
Thanks for the link, Beer can. I just opened it and know what I'll be reading tonight!