Ok so about a month ago I went to a TSC chicken swap meet and bought four EE well one soon after died and the three remaining look healthy.....I have quarantined them but when I moved them my flock of hens and 2 roos now have what I think to be coryza or MG (theres no vet by me that will take samples so this is my opinion due to lots of BYC searching) and this all started once the older hens came into contact with the babies dust! My question is should I cull the three baby EE's that I believe are the carriers? (They are all fine and dandy while my original chickens are worse for the ware) Will my hens and roos now be carriers?? I started them off on Tylan 50 on Sunday and yesterday they seemed horriable but this morning when I went out the swelling around the eyes have gone down and the wheezing and coughing has stopped also. This is my first time raising chickens and I don't want to take ny chances that someone else around me may catch this. We will be closing the flock after this. And I'll never buy pullets from someone other then a hatchery again. Any input would be helpful I'm not against culling, this is just my first flock that I hatched so I'm kinda attached.