Hello, I have raised chickens for many many years and I have never encountered anything like what is now happening with my flock. I know where i made my mistakes and I am not here to be chastised or put down, so please try to help me regardless of what you feel i did wrong. I had 18 hens from a hatchery that I have raised from 3 days old, they are now 18 months old and have been going through their first molt. Everyone has been healthy, happy and eating/drinking and pooping normally. We had a very large coop built in order to accommodate up to 30 hens so I ended up buying 10 additional English Orps from a neighbor. These hens were varied in age from 8 weeks to 3 months. All large enough to hold their own. We kept them near the original flock but separated by fencing for a week. Then we let them all free range together on our 6 acres and go home into the coop together. The following week was extremely hot. Near 100 degrees with 100% humidity and the dying started. It was always the new hens that were dying despite all of the cooling measures that we had in place. And as much as chickens enjoy a little cannabalism, they have never touched the dead hens. At the same time, all egg laying stopped in its tracks. I went from getting on average a dozen eggs a day to ZERO. This was July and there were always feathers all over the pen and yard. At this point I asked my neighbor if his hens were vaccinated for Mareks and he said that they are not. OMG! WHAT HAVE I DONE! At first they were dying 1 hen every day or 2 days for the first week. I lost 5 that first week. Then it stopped for a while. In August, I lost 3 more in the same manner. AGAIN, all the English Orps i had just bought. I worked away from home and never saw the hens in the interim, just found the bodies. Now I work at home and am watching the girls very closely. I have lost 2 more hens in the last 2 weeks. And now I know the symptoms. 2 to 3 days prior to their death, the hen stops perching and stays on the floor of the coop at night. Still eating and drinking. The next day they are seemingly becoming slowly paralysed on one side of the body. The next day they die. Today it was one of my own hens that i raised from the hatchery that was vaccinated. There are no mites or lice The eyes, nares and mouth are clear There are no sores or lumps on the skin Am I going to watch my entire flock die from Mareks? Please help me figure this out. There are no vets in my area for chickens.