Clint what about Aspergillosis pneumonia?While carriers for P.multicida have not been demonstrated, my experience with a couple of large die-offs of wild birds has led me to believe in carriers and the role of immunosuppression resulting in mortality. That being said, I am not convinced you are having cholera....it is very obvious upon necropsy, so I am not sure how it would not have been identified in the rabbits
Clint