Most vets don't know chickens... and the ones that do... know flock health management type chickens...what's wrong? Let's sacrafice a few to find out. I was dong some research on becoming a poultry vet and find most are flock management types of programs, no real avian pet types yet. And if it's a avian vet, I bet if they found what they found on your hen, but on a 10k parrot, they'd drug it up since it doesnt make food for you and lives in the house like a human. Like all medical practitioners, it's the experince that teaches them what to do and their personability that gets them their customers. Lacking either one can be a recipie for disaster. Thing is though, if you do start a course of antibiotics... please finish them. The problem is overperscription of antibiotics, the reason is because often people do not finish them so as soon as they are "better" they stop and a secondary infection of the resistant bacteria takes over and cannot be stopped. Antibiotics only help the body fight, antibiotics do not fight it alone, just attack a sub population of an infection.