why are rabies incurable
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Rabies is caused by a virus. And viruses are treated by helping out the body’s natural virus killing immune system. So without the immune system we can not fight the virus. Rabies attacks the nervous system, the brain. And due to the brain-blood barrier and a number of other things the immune system is not able to fight virus infections in the brain. So we can not really help it much at all. The best we can do is to vaccinate against rabies which helps the immune system fight the infection before it spreads to the brain. Even a vaccine given after someone is already infected will be fully effective at preventing the infection to spread to the brain.
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