For about a week now, I have noticed that my birds have been getting sick. It started with a miniature rooster sneezing more frequently than a chicken would. Later, I began to be able to hear him breathing because there seemed to be a build up of mucus. Now he still has the two prior problems and a runny nose. I've noticed other chickens beginning to "catch" this disease too. I read the sticky about how sometimes dust can get them sick and cause breathing problems but I don't think it is that. There are no poultry vets here where I live (and I live where owning chickens in a residential area is illegal so.....) a vet wouldn't help me much. What could it be and how can I cure it? Can it be cured? The rooster that began the whole sickness is now to the point where he can BARELY breathe and I think I will have to ask my dad to put him down because he is suffering quite badly, but may also be contaminating my flock. Please help!