Other living organisms, such as viruses, cause illnesses like hemorrhagic disease or blue tongue disease. CWD comes from abnormal proteins formed in the body, called prions. Prions are not living organisms and not like your normal type of germs (bacteria, virus, parasite). All animals have proteins in the body, but in the case of a prion, the protein folds abnormally, becomes transmissible and causes holes in the brain, making it a neurological disease. Other wildlife diseases, like hemorrhagic disease (EHD), are not always fatal because animals are able to create antibodies to fight the disease. Those types of diseases usually require vectors such as insects to spread, while CWD transfers through contact. The other big difference is that a virus can be destroyed relatively easily, and with captive animals, the USDA has been able to work on a vaccine for viruses in the cervid (deer, elk, caribou, etc.) family. There is no vaccine for CWD because proteins already naturally occur in the body, making prevention impossible. It’s important to know that viruses can be survivable, but there are no cases of survival among CWD.