Mad Cow Disease The brain and spine of the patient will have holes on it, similar to sponge possible cause is intake meat from cows who were affected by the disease The damage to the brain is caused by a protein called prion Cows are fed with infected bone meal Depression Anxiety Autism or hallucinations Abnormal sensation Muscle stiffness Lack of coordination Muscle twitching or stiffness Dementia or delirium Death Handle high risk food with care: spine, brain, eyes, tonsils and intestines of cows, sheep and goat Restrict meat import from infected area Forbid to feed the cows with infected bone meal   There are no infection case in Hong Kong The beef imported are from non-infected countries All the beef imported are proven to be suitable for sell