They measure your knob and if you have a horse sized knob , that means you are allergic to the vaccine .
Ha ha, only joking ????
I found out that I was allergic to the horse made vaccine due to a blood test they did at the hospital , they took a blood sample and did a test and got the results back within a few minutes
The virus makes it was from the entrance point (abrasion) to the victims brain at about 10 millimetres per day , so it takes longer to get to the brain if the entrance point was the foot , rather than if the entrance point was the chin and once the rabies virus gets into the brain, that's it, game over , nothing more they can do and you just need to wait to die .