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I'm sorry all your previous posts about this chicken got little to no response. It happens sometimes, because the posts move so fast that they disappear off the first page of "Recent Posts" within minutes.
You already have the chicken on antibiotics, so I hesitate to tell you to change it now. To switch now would mean several days of double dosing, not really a good thing, since they will mess up the gut action. One thing for sure, get some plain yogurt going in daily. It will help keep the healthy gut flora going. And definitely check on the Oxytet to see if it can even help with respiratory problems.
What kind of bedding are they on?
Is there a lot of dust?
Any mold or mildew in the area?
Was the carrier sterilized before use?
Don't know that it will help you right away, but this is SOP for emergencies and illnesses:
https://www.backyardchickens.com/forum/viewtopic.php?id=3569
and the search function, top right, can answer many questions for you, without having to wait until your question gets noticed.
Good luck, hope it works out well.