Hello, please look at the incubation period of rabies first:
Generally, after being bitten, the virus moves along the peripheral nerve axis to the central nervous system at the speed of 1-3mm/ hour. The incubation period of rabies virus in human body is generally 30-60 days, the shortest is 10 day, the longest is one year, and rarely exceeds one year.
1, in fact, only 1% of them have exceeded 1 year, which can be said to be very rare. After 1 year, it is basically considered that they will not get sick.
2. Injection before onset is effective, but it is impossible for people to carry rabies virus after the longest incubation period (1 year), but I don't think it is necessary to inject again after 1 year.
3. As mentioned above, after being bitten and scratched by animals for one year, there is no disease and it will not happen again (only about 10% of people bitten and scratched by animals may be infected with rabies virus); Generally, vaccination after bite and scratch is only the second time, and it is of little significance after one year. It should be vaccinated as soon as possible after bite and scratch.
If you don't believe me, I'll tell you, no matter how long it takes you to get the rabies vaccine after taking a bite, as long as you don't get sick after five shots of the vaccine, it will definitely work.
Once rabies occurs, it is incurable, so whether you are infected with the virus after biting or scratching, you should get rabies vaccine as soon as possible.
Your father had four injections, and the antibody may have been produced, so it doesn't matter, which means that the bite your father took last year won't get rabies;
I wish your father health.