The rabies virus can pass through the barrier between blood and the brain, but antibiotics can not. So it is treatable before the virus gets into the brain and the patient starts showing symptoms, but not after. There have been cases where it actually was treated after that by putting the person into a coma and letting them develop their own immunity (or letting the virus die out? Not an expert, so not sure about the details), but it is very rare to actually work
Edit: fixed some grammar
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