I have a large diverse flock. I have 7 laying hens about 11 months old and a 5 month old rooster. I also have 12 pullets 5 weeks old. i also have 26 random bantams that are 3 weeks old. A few days ago I had another rooster that was attacking my children so I culled him. The day of the culling he was coughing and weezing. Two days later 2 of my layers would not come out of the coop. I took them out and one was coughing. The other had her eye closed shut and snot built up on her beak. I removed them to a cage as to isolate them. We treated them with Tylan 50. All of my chickens free range all day long. They are all using a common water source and feeders. I have disinfected all the feeders and waterers. I have added a probiotic and electrolyte solution to all the waterers. My question is is all of my birds going to get infected? If any of the infected birds survive will i be able to breed them and sell the chicks?