This looks like it could be caused by either Infectious Coryza or Mycoplasma Gallisepticum (MG). I’m leaning towards the Infectious Coryza side. Check to see if there is a foul rotten cheese like smell. If there is no smell, you’re most likely dealing with MG.
Infectious Coryza is a bacterial infection of poultry, affecting all different species of birds. Infectious Coryza is known for it’s foul smelly cheese smell that comes from the face, mouth or nares, followed by thick harden pus to form in the sinus cavities and around one or both eyes, creating a “swollen bulging like eye”. Infectious Coryza infected birds may or may not have thick sticky yellowish colored discharge from the nares or eyes. This disease is most commonly by being exposed to new or other carrier birds. Coryza is a chronic disease meaning, that you can treat and have the symptoms go away, but whenever the bird gets stressed again, the symptoms will keep coming back or get worse. All “recovered” like birds, remain permanent lifetime long carriers of the Infectious Coryza bacteria, spreading and shedding it through their feces, feathers, dander, respiratory secretions and other bodily fluids. This is a lifetime disease of poultry and is incurable. Since Infectious Coryza is a bacteria, antibiotics can help keep symptoms at bay until next time. Keep in mind as well that constant over-use of antibiotics can create antibiotic-resistant bacteria, making the disease harder to treat than before. It’s critical in poultry to get sick birds tested to find out which specific disease they have as soon as possible.
Here’s more information about Infectious Coryza:
https://www.thepoultrysite.com/disease-guide/infectious-coryza
https://tvmdl.tamu.edu/2019/11/25/infectious-coryza-in-chickens/
https://www.canr.msu.edu/news/infectious-coryza-could-be-a-concern-for-poultry-owners
Chronic Respiratory Disease (CRD), or most commonly known as
Mycoplasma Gallisepticum (MG). MG is a bacterial infection of poultry, affecting all different species of birds. This disease is most commonly given from infected parents to the offspring, as the MG bacteria can be transmitted vertically into the eggs of developing embryos, making any chicks that hatch, always infected and sick with the bacteria. So please please PLEASE don’t breed from your sickly infected flock! MG is a permanent lifelong chronic disease- meaning, that you can treat or have the symptoms go away, but whenever the bird gets stressed again, the symptoms will keep coming back or get worse. All birds (even recovered birds) remain lifetime long carriers of the MG bacteria, spreading and shedding it through their feces, feathers, dander, respiratory secretions and other bodily fluids. This is a lifetime disease of poultry and is incurable. Since MG is a bacteria, antibiotics can help keep symptoms at bay until the symptoms resurface. That being said, most choose to cull all birds and start over fresh. If you’d rather not, then the other option is to keep a closed flock- no new birds in and no birds leave your sick flock.
Keep in mind that over-use and/or misuse of antibiotics also creates antibiotic-resistant bacteria, making the disease harder to treat than before. It’s critical in any livestock, especially poultry, to get any sick or symptomatic birds tested to find out which specific disease they have as soon as possible.
Here's more information about MG:
https://extension.umd.edu/sites/ext... Mycoplasma gallisepticum (MG) Infecti....pdf
https://www.freedomrangerhatchery.com/blog/protecting-your-flock-what-you-need-to-know-about-mg-ms/
https://afarmgirlinthemaking.com/respiratory-conditions-poultry-mycoplasma-in-chickens/
Doesn’t really matter which disease you’re dealing with, so I suggest keeping a closed flock and don’t breed to sell to others. I hope this helps!
