I’m watching the sister. If she dies I will send her for an autopsy. It’s odd that the sisters got sick and no one else, yet. I’ve had all of them for at least 5 years. Thank you for the feedback. I will post her status and findings.
time to get them tested. don't hold off on this.
scary as it may be but this sounds like VND. get them checked out asap.
we all listed the vets in your area so should be easy enough to find.
Have you added any new birds recently, or could they have been exposed some other way? Sorry that you are dealing with a disease. If you could try to get an antibiotic from a vet locally, that might be helpful. Some, such as doxycycline and tylosin are available online for pigeons. It would help if the cause is bacterial, such as MG or coryza, but it won’t cure the disease. The common diseases in chickens are infectious bronchitis, mycoplasma (MG,) coryza, ILT, and aspergillosis. Here is a good link that gives symptoms of those diseases: https://edis.ifas.ufl.edu/ps044