I am so glad you got ahold of someone. when you speak with them again and if the chicks are still not responding to the Corid ask the pathologist if she suggests switching to Sulmet. I know Corid kills The MOST COMMON forms of cocci but their are many strains. if I remember correctly Sulmet gets the strains that Corid does not. Corid is first choice because it kills the most common. But if I remember right, some folks in the past had to switch to Sulmet. See if the person knows anything about that. if it IS considered coccidosis and you are getting no improvement with Corid, you might make the decision to give Sulmet a try. if I was in your shoes that is what I might do. What a awful experience! I am so sorry. I've been through a large loss once and I know it's absolutely devastating. what happened with mine was I was giving a live virus vaccine. The point was to give them a very small amount of the virus and their bodies develop immunity when they fight the virus.well, they got the virus. But NONE were able to get through it and I lost them! it was so horrible! now the ONLY vaccine my birds get is MAREKS. I had no idea that a live virus vaccine carried such a risk. Anyway, I do understand how your feeling and how frustrating it is.Your in my thoughts and Prayers. I hope in some small way I've helped . Again, I'm so very sorry.Keep us posted please.