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I would not say "need" here. Antibiotics are an option, but without diagnosis, there is certainly risk of having a flock of carriers, and spreading one of these diseases to other flocks. Culling the flock, or at least the affected birds, is certainly another option. Brave roosters needs to do his research on resp. diseases in chickens and make an informed decision.
Here is one resource, of many:
https://www.backyardchickens.com/web/viewblog.php?id=15239
Aha, back to this old chestnut again - 'immediate mass cull' vs 'antibiotics and closed flock'. The UK and US approches to MG are very different. My kneejerk as a UK keeper is to do everything to help the birds to recover, but I know a lot of poultry keepers in the States think differently and have a far more radical approach to tackling MG. ie cull the lot. (You also have legislation in some states over there which makes it a notifiable disease, I believe - but I don't know very much about that.)
However, my original post still stands: if braveroosters doesn't wish to cull, and wants advice on getting the hens healthy again, the birds do NEED antibiotics in order to recover from this episode of MG (if it is indeed MG). They will remain carriers for life, that's for sure.
Culling is perhaps something he/she would prefer, once reading all the available advice, but I was just offering my advice about the
treatment option...