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I believe "purple Chicken" Had this problem and found out that he DID NOT have to cull ALL of his flock.
It does get tricky though. There WILL BE a carrier if one does not cull the sick birds. If left alone a bird will get over the illness (or die) and then become a "carrier" for life.
Guinea fowl seem to have a strong resistance to this disease and the breeding stock such as the white rocks, the leghorns, the australorps, the NJ giants, the orpintons, the cochins, the wild games and games in general seem to take it in stride or die within a week.
Coryza is a very nasty disease and I would not wish it on any one here.
I am so sorry this has happened, but you REALLY need to find out if it is IN FACT Coryza.
MG or Chronic Respiratory Disease (CRD/MG) has a very similiar outward appearance.
CRD is not as devastating as Coryza and birds that become immune live a long life, but are carriers as well.
Please see my BYC pages as I do have information on a good deal of diseases that affect poultry.
