If you have oxine by all means use it, your desperate now... Now one can tell you to cull, you have to make that decision... so sorry your in that place... if you don't want to cull then you'll need to find out what antibiotic is the best and if it will even work. I'd suggest you contact Cornell.
Yes, Miss Lydia is right--though I never recommend treating this stuff, I also can't make that decision for you. You must be convinced in your own mind. And I agree, use the oxine now. It's what you have, go with it. Your state vet may be able to test for you, too. At least, you'd know what was going on for certain.
I noticed drops of blood near the outside flock and they are sneezing often. What is this?? No eggs either --could be cause I had moved the nestbox though.
Different ages, but all about 5-8 months. No, it isn't cocci, they were all medicated too. Also my hen in the house has a funny yeasty smell; could just be the bedding though.
Are they stressed? Is it cold where you are, did you change a routine, have they been fighting? Stress brings on cold like symptoms from CRD that doesnt otherwise act up.
I'd try fresh air and yogurt if you think they might be stressed. 9 times out of 10 thats what was up with my hens when they had these symptoms.