If questioned if the zombie apocalypse is possible, most scientists suggest it is possible that a disease hybrid would be the most prone thing to happening.
AN INFECTIOUS DISEASE OF DOGS, CATS, AND OTHER ANIMALS, TRANSMITTED TO HUMANS BY THE BITE OF AN INFECTED ANIMAL AND USUALLY FATAL IF PROPHYLACTIC TREATMENT IS NOT ADMINISTERED
Pathology . an acute, commonly epidemic disease, occurring in several forms, caused by numerous rapidly mutating viral strains and characterized by respiratory symptoms and general prostration
a fatal neurological disease of cattle, characterized by spongelike changes in the brain and thought to be caused by an infectious prion also implicated in Creutzfeldt-Jakob disease.