I have an outbreak of Coryza and I am not able to find out if the loss of production will be permenate, or only while symptoms are present. Can anyone help with that?? I know I'll have to replace the whole flock to get rid of it, but should I wait untill the current young hens are past the 2nd laying cycle, or will the production be so low that I should start over with clean chicks now?? Thanks....stan