About a third of them are sneezing and have foamy bubbly eyes.. They are eating. And they are a mixed age flock, but everyone of them was hatched here. I haven't brought in a outside bird for over a year. This all started about a week ago... The weather in cold and wet. They were doing better when it was freezing and dry. Should I just give them ALL a round of antibiotics. The vets around here laugh at you if you ask anything about poultry. I have 5 Muscovey ducks too, will it hurt them to drink the meds.. I already culled one bantam roo... I really would rather not do it again..