One of my red rangers has a horrible honking cough/ sneeze. I immediately isolated her and started a course of terra vet at 1 1/2 Tblsp per gallon. I haven't detected any sneezing or rattling with any of my others (layers, meaties and two ducks), but have yet to go out and do a bird by bird check. I'm going to dose the entire flock with 1 Tblsp/ gal in the meantime. We've had terrible wet weather and I think this is what's exacerbated this condition. Any advice about othet treatment or precautions to take will be welcomed. Only been at this for a year and need any help I can get!