Infectious Laryngeotracheitis. It is a horrible, very infectious virus, which can be carried by wild birds, or in our case many years ago we accidentally brought it into our flock when my son brought home some hens from an Amish auction. We had them quarantined but it did not matter, ILT is airborne. It is a rapidly fatal illness and, as I said, very infectious. Signs are rattly breathing, coughing up blood, strange smell (sometimes) about the bird, swollen and crusty eyes, apathy, poor appetite. But if your roo has been sick as long as it sounds like he has, I don't think he has that. It usually kills in a matter of a few days, and also at least some of your other birds would be showing symptoms. And it's almost always fatal, although not necessarily. It can only be diagnosed by necopsy. But it is always possible that your roo has a viral illness of some kind, rather than an infection. Or it could be fungal.
