A state lab has done 2 necropsies for me and concluded that I have Mareks in my flock. There was an initial blood test done which had come back negative. The vet was confused about how that test was negative and the pathologist explained that the blood test only checks for the most common strain of Mareks. I unfortunately have one of the less common strains. The pathologist also explained that there are different types of Mareks vaccines. Commonly some people use the cheaper vaccines to save money, but it only protects chickens against the most common strain NOT various strains. I now have to back track where my chickens came from and what type of vaccine they were given. I learned today that 3 of my chickens were vaccinated with a HVT Bursal vaccine. Is anyone familiar with vaccines? Can someone please tell me if this vaccine works against multiple strains and not just one type? I DO understand that even if it is for multiple strains my chickens might still all die. I know that vaccines don't always work... I'm just searching and praying for some glimmer of hope. I only have 1 left of the 6 I started with. I had repopulated BEFORE I realized I had this awful disease in my flock. Our chickens are loved by my whole family.. They are our pets and part of our family. I've only had chickens since May and this whole experience has been devastating!! Lost our favorite one Christmas morning, and lost my beautiful rooster this morning. Anyone who can share any knowledge with me or experiences with this is greatly appreciated!