Mycoplasma g. is the most common respiratory illness, so it's a safe guess. Get right on the treatment and you can cut this thing short. Tylosin soluble is easy to use in the drinking water so you can treat all the flock at once. It's doubtful there's any advantage to segregating the sneezers and coughers as all the chickens have been exposed by now.
A tip on mixing the Tylosin powder, add the powder to a little water, mix well and then add that to your drinking device.
A tip on mixing the Tylosin powder, add the powder to a little water, mix well and then add that to your drinking device.
