About 10 days ago I picked up 8 pullets (about 10 weeks old) All looked good. I put them in with my existing flock (3 silver lace wyandots, 2 barred rocks, 1 banty, 1 silkie (my pettin' chicken) Big mistake I know now.....everyone seemed okay, I fixed a new area in the barn for the pullets and got them moved (they spent 1 night in the coop) The next am 1 of the pullets was dead. No symptoms that I saw.....with my other girls....some of them have stopped laying, everyone eating, pooping, etc., 3 days ago 1 of the barred rocks died and today 1 of the silver lace......fed them all treats this am, everyone eager and perky, then gone. Crop seems ok, vent seems ok, Looked everyone else over, they seem fine. I've looked at the poop, no signs of worms. Any ideas?