PING!
I want to hear the answer to this because I think I'm in the same boat. My original "flock" (=4 hens) got a whole bunch of things including coryza due to my poor biosecurity. One Ameracauna survived, kept laying, and never had any symptoms of anything. I know that she is probably a carrier of all that junk but I went ahead and got 10 chicks this spring because I wanted more eggs and some broilers. One BO dropped dead with no apparent symptoms of anything, two more (a barred rock and a mutt) got foamy eyes/lethargic and we culled them. Now I have another BO and a mutt roo with the same symptoms. It doesn't have the coryza stink so I'm thinking MG/MS but not sure. I have a call into the extension office and am hoping I can get a culture done to find out what it is.
Anyways, the point is if I don't want to cull everybody right now (I don't show or sell, they're mostly pets) should I keep culling at the first symptom or is it likely that they've all been exposed and I should give them a chance to get through it? Or is that cruel to the sick ones (crueler than culling)?
My DH is pretty resistant to culling everyone and starting over - at this point I think he's ready to be done with chickens and he doesn't want to cull birds that aren't sick. I know I should have culled the surviving Ameracauna before getting the new chicks but she's so sweet and I just couldn't do it. Sigh.