Diseases of brain are hard to treat. When a virus or bacterium infects the brain , it is very difficult to treat and it and is visual deadly. For example when the rabies virus infects the brain it kill 99% of all infected patients. Why do you think this is so?

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Solution

Usually in fatal brain disease, the entire nervous system is affected. As you know, the nervous system has important centre in brain and spine. So in a brain disease, generally nervous system gets infected and since nervous system covers the entire body, the disease has effects on our entire body. It is very difficult to cure such a disease.

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