This has been going on for two months now. Main presenting symptom has been finding blood-tinged liquid soaking through paper towels and newspapers in the coop. All birds are 15 months old. Hatchery stock that I purchased through our feed store at one day old. Buff Orpington and Light Brahma were examined by vet, who put the BO on Baytril. Two weeks later, still finding the discharge in the coop; same two hens were taken into vet, this time she said it might be caecal worms and all three hens were treated for that and then re-treated two weeks later. The Light Brahma was also given antibiotics. A few days after the last worming treatment my Light Brahma became reluctant to walk. Took her in again and the vet did an xray, said she had hip degeneration and prescribed rest and anti-inflammatories. She died three days later (Sunday). This morning I was horrified to find more blood-tinged liquid in the coop. I don't know whether it's coming from the BO or from my EE, who is the only one who has not been treated with antibiotics. I know the vet did a faecal float so am assuming cocci has been ruled out. The other diseases that seem to be characterized by the bloody discharge symptom are Lymphoid Leukosis and something I found called Newcastle Disease. Would the faecal float have ruled out these? I keep the coop meticulously clean so there are no issues around that - all droppings in the coop are disposed of each morning and soiled bedding is replaced. The chickens free-range in our yard several hours a day. The two remaining birds are acting healthy. I cannot face losing another one and I feel completely helpless. Any guidance would be appreciated.