I need some input, advice, help figuring out what is the best option. We have had our original flock for just over a year. Every thing had been going great! I got some new birds recently and made the stupid mistake of not quarantining them for 30 days, after a week I started to integrated them into our existing flock. They have been with our original flock now for 1 month, this week has been horrible... the whole flock is ill. Swollen faces, discharge from nostrils, sneezing, lethargic, not eating much, watering eyes with bubbles in the corner of their eyes, raspy breathing, huge drop in egg production (was getting 18 eggs a day, now getting about 4). 3 of our flock have passed away without showing any symptoms, they were dead in the morning. I have not had any tests ran just yet, as I have to send them to the state vet as there are no vets in the area that will see chickens. Is it best to completely depopulate the whole flock, treat the ground and coop and leave empty for a few months before trying to bring in a new flock, or would it be better to treat with antibiotics and just have a completely CLOSED flock? We had sold birds, hatching eggs and chicks before this happen but since they started getting sick last week we have stopped all sales as I do not want to give this to anyone else's flock, its devastating. I feel sick to my stomach, I knew I should have quarantined for 30 days but I failed to do that... what is the best option moving forward?