Hello everyone. I hate to reach out to you all with such a morbid topic. We are new to raising chickens. Sadly, our flock of girls are dying off which seems to be every few weeks apart, which started in November. It started with the smallest birds, and have moved up to the larger hens. We have started with nine hens at approx. 5 weeks old, and are down four hens with the looks of another sick girl. We took our last sick girl to the vet, and the vet tested for worms (had some), coccidiosis (small amount so she didn’t think that was the cause of illness) but did not test for mareks, though that was what she suspected. The last girl was put on Panacur, which didn’t keep her alive. We have also tried Corid but they are still getting something and dying off. They are currently 7 1/2 months old. The latest sick bird was just acting normal and laying, now this morning is showing similar signs of the others that have died. We would greatly appreciate and feedback or similar experiences as we cannot trace down the source of this problem.