My grown chickens have developed an illness that is very complicated. I took it upon myself to get veterinarian help. Treatments did not work on my first very sick hen. Sent off another hen to UT Austin college for dissection. Concluded that the dead hen had fowl pox. The symptoms don't all add up to fowl pox from the extensive research I have been doing. I have baby chicks inside at this time and I do not want them to contract what my grown hens are developing. Symptoms progress over months, 6 months or more. I currently have a Cochin Bantim Rooster and a Old English Hen that shows no symptoms. The ones that have died are 1 Barred Rock, 3 Red Star, and 1 Black Star. Currently have another Black Star showing Laten symptoms. Unsure what to do. I love my chickens and hate to eradicate them, especially if they seem healthy, laying eggs, and have no issues. Symptom timeline below Goes away after a few weeks: Clear runny nose Shaking head to release secretions Open mouth breathing at times Constant: Egg Production stops suddenly Decreased Appetite Runny Stools and White Liquid Cluck turns into a Goose Noise In the End Symptoms: A few days to a week before death Unstable, easily falls to either side Both wings droop, slowly progresses downward Tired, staying in coop -not free ranging much Separating self most of time away from flock Having difficulty keeping eyes open, like half shut most of the time. Please Help!!! Chickens are a very complicated bird, if sickness becomes apart of the flock. I experimented with my first few sick chickens. Quarantined, gave tylan 50 & tried other local feed store antibiotic. Vet did steriods, some improvement but did not work. Added apple vinegar to water regularly. Got Vet RX to see if it would help at all, don't see any changes. Tried an Electrolyte solution, made hen open mouth breath more. Stopped each one after no improvement on symptoms. Gave accordance to directions and BYC posts. Fyi: After each bird died, I would disinfect the coop. I regularly sprinkle DM powder around the coop area and inside the coop and also the nesting boxes. I clean my very large coop weekly or every other week. Each bird has more than enough space. Fresh water is available at all times. Feed is mixture of scratch, pellets, crumbles, and meal worms. I very rarely feed them human scraps because they have plenty of land to free range. I feel I am doing everything by the books and what Ive read, so why are they still getting sick? Any suggestions that I have not thought of or should try? I am exhausted with trying to figure this out. I truly love my chickies way too much!