1. Even if the virus has reached the spinal cord, the post-bite anti-rabies vaccine can still be effective because it stimulates the immune system to produce antibodies that neutralize the virus. These antibodies can prevent the virus from further replicating and causing more severe symptoms. However, the effectiveness of the vaccine may depend on various factors, including the individual's immune response and the timing of vaccination relative to exposure 2. Once the rabies virus enters the spinal cord, it can travel relatively quickly to the brain through the nervous system. The exact time it takes for the virus to reach the brain can vary depending on factors such as the individual's immune response, the strain of the virus, and the severity of the infection. In some cases, symptoms of rabies can manifest within days to weeks after the initial exposure

1. Vaccination immunity is useful until the virus reaches the brain. Only after it reaches the brain Vaccination is not useful. So yes, the vaccination will be useful even if the virus is in the spinal chord. 2. Rabies virus travel appox 0.25cm per day, so based on the height of the individual, the time period will vary 3. Since it has been 1 year, the vaccination immunity is fullest during that period, so there is almost zero chance for infection