I started a thread below but have new questions. I suspect our 2 new chickens carried CRD into our small flock. Our previous birds are getting sick but the new (suspected carrier) birds seem happy and healthy. Since I am giving Liquamycin to the sickly birds, should I even bother giving it to the carrier birds too, since they seem healthy? They've had 2 doses already (was just thinking I needed to dose them all) but after further contemplation, I don't know if it will help or hinder. Care to share your thoughts? Thanks in advance!