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Are these your only chickens? If they are not, and you have an original flock, i hope very much that they have not been together.
Most respiratory illness in chickens is such that causes the chicken to be contagious for life, even if you are able to quell the symptoms with antibiotics, etc.
If it were me, i would have to make the difficult decision to put down any birds showing symptoms and to quarantine the the rest of the new birds for about 8 weeks to see if i could be convinced that they are healthy.
If you choose to keep them, please keep a completely closed flock......no new birds, no selling or giving away any birds, no free ranging where they could come into contact with other birds.
I'm very sorry that you're having this trouble.