I'm dealing with Marek's once again. I've just lost a polish hen yesterday and our main rooster has been in an isolation ward for the last 2 weeks, fighting for his life. We've lost quite few other birds from this flock due to Marek's over the last couple of years, even though they were all immunized for it at day 1 and are all over 2 years old.
I'm from Northern California and lately, we've seen a huge increase in Marek's here. I've raised chickens all of my life and I'd never even seen Marek's until just a few years ago. It's become a serious threat around our area and was a big topic of discussion at the local feed store last week. There is one story going around about the large-scale, poultry producers in Petaluma. Many years ago, they had to destroy whole houses of birds due to Marek's. Most of these poultry houses are gone now, but the disease is still around and more prevalent than ever. I can't say it's their fault, but we should look into the possible causes more carefully. I'm curious about doing the back-up immunization at day 7. Perhaps it could help. I'm also all for breeding for disease resistance.
I know that someone has already posted a reference about the disease and its symptoms. http://www.backyardchickens.com/a/the-great-big-giant-mareks-disease-faq Perhaps we can update the current sheet on the latest developments on this topic, instead of putting it in a long thread, so it is easier to find the information needed.
Edited by Tropit - 4/9/16 at 11:29am