Some food was made from cattle that had the disease.It has a long incubation period, about 4~5 years.It comes from the chemistry structure of prion protein. Mad cow disease has damaged the cattle industry.In the England, the nation that worst affected, more than 179,000 cattle were infected and 4 million were killed in an attempt to get rid of the disease. Mad cow disease is the common name of Bovine spongiform encephalopathy.The brain becomes spongy and begins to waste away.The cattle become very violent and show signs of mental disorder and have trouble when they move.Cattle that are 4~5 years old can get the disease very easily.It was not a common disease, but in 1996 the Minister of Health and Welfare in England said that it could be contracted by humans.When cattle get this disease, they have holes forming in their brains. It's a disease that affects a cow's nervous system. Source : Wikipedia
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