Three days ago I let my chickens out to free range. And noticed my rooster was lethargic in the head hanging down. I isolated him the very next day. He would just stay hunched over in the sleep all the time also had runny nose etc. Then I'm in my coop and I hear one of my hens gurgling. So I remove her from the coop indoors to a dog pen. And I start treating her in the rooster with Tylan 50. Also they were not drinking so I tried to hydrate them with anabiotic water. Then the next day another one of my chickens was coughing and sneezing and so I brought her in an isolated her and started treating her with Tylan 50. I had one of my hens died yesterday. The department of agriculture in Oklahoma gave me an amazing service and came out to my house. they had me refrigerate the first dead chicken so they can test it. And even though the rooster was still alive he had remained hunched over without eating or drinking for four days. So the department of agriculture decided to take him and euthanize him and test him as well. That was this morning. Going out to my cute today I noticed 2 to 3 other hands displaying mild symptoms. So it is reach the point where so many of them seem to have it that I cannot keep up treating them with Tylan 50 Orally. So has about made the decision to just treat the ones I already have isolated with Tylan and leaving anabiotic water in with the rest of the girls. I can't keep up with grabbing and treating each and every one that's displaying symptoms. My chickens have always been extremely healthy. I added chickens to my flock about a week ago. I receive those chickens from someone who was very trustworthy and very conscientious about chicken health. In those chickens never showed any signs of illness. I did not quarantine them before I release them with my chickens. Which I thought at first was a mistake. When I talk to the department of agriculture they said that those chickens may not have ever showed any signs of illness but had built up and immunity and brought in a virus that my chickens had never been exposed to before.. So my thinking is really even if you quarantine them they made shown no signs of illness but still bring something into the flock. The last few days has been exhausting and heartbreaking. I've lost the rooster in one hen so far. I still have three in isolation. But at least three others in the Cooper showing symptoms and I just can't stay on top of it. And I'm just going to treat the rest of the flock with anabiotic water. The Department of Agriculture is going to run test they said it would take about two weeks to get back with me. I'm just sick that I thought when one or two chickens were sick I could treat them by hand but now that so many have become sick with this I just can't keep up with it so I'm gonna do my best and hope for the best.