This thread is old enough the birds in question have probably died of old age
Seems like they had cocci though. Read this thread it will list symptoms and treatment.
In a brooder they get cocci from eating feces, try to eliminate/limit their ability to do that.

Seems like they had cocci though. Read this thread it will list symptoms and treatment.
In a brooder they get cocci from eating feces, try to eliminate/limit their ability to do that.