I am also new to backyard chickens. I have had 6 speckled Sussex chickens since 2 of 2013, I have 3 Polish and 2 silkies. As of 7-6-13 I now have 3 Sussex, 2 Polish and 2 silkies. I do not understand what is going on. They seem fine one day and dead the next. I took my Polish who was just 4 months old to the vet and just to far gone for my vet to save her but he tried. My speckled Sussex received the same treatment and she died the next day. I have taken the Polish for the necropsy and waiting for answers and hoping to have the answers before the remaining die. The only indication I had that something was wrong was bloody stool and of course found on a Saturday night. Hours after that I would see her spare ted from the group not eat and hours after that we would die. I feel like a horrible chicken keeper also. It is just so disappointing when you try so hard to make it all work out. So far the others do not show any signs but I have to work so I have not seen them today. My vet said he has never seen a parasite like this before (an he should know he has been around forever). I bought them for egg laying but they are all my pets and I love to sit and watch them so I really miss them.