Very very interesting. What does the breeder do? Let nature take its course and breed survivors? For resistance?
Basically. He lost a lot at the beginning, now he only loses a few a year. From hearing talk of people losing their birds, and the symptoms, I have to assume that mareks is very prevalent where I am, BUT, it seems to be a fairly weak strain, so breeding for resistance is almost more feasible than with some people that have a strong strain.