Mad Cow Disease in California: Mad cow disease is variant Creutzfeldt-Jakob disease when it transmits to humans via ingestion of cow central nervous system tissue. The disease can cause dementia, memory loss, and personality changes. The cause is a microscopic, foreign protein called a prion, which is distinct entity from viruses and bacteria.
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Mad Cow Disease (Variant Creutzfeldt-Jakob) in Humans Mad cow is an infectious disease in the brain of cattle. Variant Creutzfeldt-Jakob disease is the human form of mad cow disease. Symptoms and signs include muscle spasms, lack of muscle control, and worsening problems with memory. There are no effective treatments.