Our chicken is wheezing, No coughing, it started this

I'm sorry to hear about this with Elizapeck (!).

In any case of respiratory illness, it's important to know if you're dealing with a viral, bacterial, fungal, or parasitic disease. The treatment for one disease may be ineffective or even harmful to others. Respiratory infections in poultry have several causes but outward signs may appear similar to the flock owner. To make a diagnosis, an avian vet (bvpa.org.uk or local poultry vet) will perform several tests including bacterial cultures of the airways, blood tests, and necropsies* of dead birds (or sacrificed badly ill birds) if they're available.

Regrettably, the UK doesn't allow chicken owners to purchase antibiotics over the counter for them.  An avian vet is likely to prescribe tylosin, enrofloxacin, or amoxicillin/clavulanate.

No antibiotic, however, is able to completely rid my patient of these infectious organisms. Birds remain carriers and sources of infection others. (Please note that we have limited data of tylosin administered orally to chicken layers. For the use of injectable tylosin in laying hens, FARAD now recommends an 8-week egg discard period.) Please also note that the majority of these chickens will go into remission unaided within 10-14 days from the onset of their symptoms.

*Dead birds should be refrigerated - not frozen – until they can be necropsied. Your best course of action might be to reach out to your state or county-extension poultry personnel, veterinary school pathology service, British Veterinary Poultry organisation (bvpa.org.uk) or avian-oriented veterinarian for help in that regard. This is how we might know how to address the rest of your flock.

Please respond with additional questions and concerns if you wish.

If you need clarification on anything I've posted or have additional questions or concerns, please don't hesitate to ask.