I have some questions about this disease which is going thru my flock now. I have read various information about chicken diseases and I am pretty sure coryza is what my chickens have. I understand the chickens will always be carriers. I have some chicks which will eventually be integrated into my flock. Will they get this disease even if the rest of the flock is all over it by then and shows no symptoms? And any new birds I may purchase are at risks of "catching" coryza? What happened in my case was I bought a rooster and two hens from a well known breeder in my area. She seemed to have such excellent bio security measures (asked me to wear clothing and shoes that hadn't been around chickens and sprayed the bottom of my shoes with oxine before entering her chicken area) that I did not quarentine the chickens I got from her. Within a few days the 3 chickens I got from her were sick. None of my chickens, all of whom I have raised from newborn chicks, have ever exhibited any of these coryza like URI symptoms. Now this disease is going thru my flock. One young banty rooster has it really bad, some just have the rattle/throat thing, some are lethargic, some exhibit no symptoms at all. Yes, I am kicking myself now, but it is what it is. So far I have been treating with Sulmet, pedia lyte, and starting tylan tomorrow. New experiance for me since I have never given anything an injection before. Am wondering if I should put it in the water for the whole flock too? Thanks for any help.