afaik that's not true at all. Rabies isnt a "few hours" sort of disease unless you got bit on the neck maybe. Most bites are on extremities. If you are bit you have to get the vaccine within a limited amount of time, like a day or 2 (before it spreads to the brain) in order for it to be effective. If you get it too late it's a done deal. Something like 1 person ever has survived untreated rabies (last i read about it 10 years ago maybe more now) and basically that person was put into an induced coma to give the brain a chance to recover from the virus on its own. There's no "treatment" for rabies