This is my first batch ever of chickens. They're nine week old RIR pullets, obtained through local feed store which got them from a very good hatchery. They've been sneezing almost since day 2, I'd say. They're active, eating and drinking well, but they have this sneeze. I just noticed a bit of nasal discharge when they sneeze. Vets around here don't handle chickens and I can't afford to go that route anyway. Are they doomed? What can I do?