Bison in Yellowstone National Park also originally contracted the bacterial infection known as brucellosis from domestic livestock.
Listeriosis, brucellosis , and rabies could account for the symptoms and all three ailments were endemic to the area.
Acute bacterial infections, notably salmonellosis, brucellosis , pertussis, tuberculosis and rickettsial infections, can cause neutropenia.
Behind the killings are Montana livestock officials, who claim they are protecting cattle herds from brucellosis , a disease that can cause cows to abort and is spread by birthing material.
An estimated 50 percent of the bison in Yellowstone carry a bacterial infection called brucellosis which Montana and federal authorities spent decades and tens of millions of dollars eradicating from cattle herds in the state.
This bacterium causes a disease called brucellosis in sheep and goats.
Other causes of encephalitis include influenza, listeriosis, brucellosis , Rocky Mountain spotted fever, whooping cough, rabies and lead poisoning.
Though now rare, chills and fevers in a butcher or veterinarian suggests brucellosis (undulant fever), a bacterial infection transferable from animals to man.
Chronic wasting disease, West Nile fever, brucellosis , avian botulism, avian cholera and others have impacted wildlife populations.
Other diagnoses included diarrhoeal disease, dengue fever, typhoid, pneumonia, urinary tract infection, brucellosis , acute myeloid leukaemia, and infectious mononucleosis.