Thank you! I am going to talk to the vet tomorrow about a necropsy so I can be sure. At this point, I am willing to pay the price just to know! I guess there is still the possibility that it isn’t Coryza, and her face could be swelling due to something else. Do you know if fowl pox or any other sicknesses cause a puffy face?
My friend with the MG, her Roo's eyes swelled. When she pushed a bit, mucus would come out of the eye, nares & globs of it in the beak cleft. The bad breath odor was nasty. She said the lab guy did swab tests to diagnose her Roo & a few hens...while alive, they do not have to be dead for testing. You need to get this bird tested so you know what you're dealing with.
MG & Coryza have similar symptoms.
https://www.backyardchickens.com/threads/chickens-eyes-swelling-have-pics-please-please-help.990792/
https://poultrykeeper.com/respiratory-problems/mycoplasma/
Medicines used (some survive, some don't)
Coryza
Erythromycin and oxytetracycline are usually beneficial. Several new-generation antibiotics (eg, fluoroquinolones, macrolides) are active against infectious coryza. Various sulfonamides, sulfonamide-trimethoprim, and other combinations have been successful.
MG
The efficacy of treatment with single dose administration of 5 drugs at different dosages to layer hens naturally infected with Mycoplasma gallisepticum was studied. The drugs were tiamulin, which was administered orally, tylosin (parenterally and orally), spiramycin (orally), long-acting oxytetracycline (parenterally) and tylosindihydrostreptomycin (parenterally). Cure was assessed by the absence of nasal discharge. The cure rate was significantly higher (P less than 0.05) in treated hens than in untreated hens, as early as 1 day after treatment. Remission for 33 days was achieved in 60% of hens treated with 100 mg oxytetracycline, in 100% of hens treated with 100 mg or 200 mg spiramycin, in 92% and 85% of hens treated with 100 mg tylosin, parenterally and orally, and in 89% and 88% of birds given 100 mg tiamulin and tylosin-dihydrostreptomycin, respectively.
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