- Oral feeding with animal protein residues from sheep with diabetes or cattle infected with the same disease through feed additives is believed to be the cause.
- The transmission of the disease from one animal to another has not been proven by another means and has not been confirmed to be transmitted to the fetus.
- The disease was developed by laboratory injections part of the brain and also infected by mouth.
- The transmission of the disease from one animal to another has not been proven by another means and has not been confirmed to be transmitted to the fetus.
- The disease was developed by laboratory injections part of the brain and also infected by mouth.
