You might be working in some risk environment if you have taken pre exposure prophylaxis. Research suggests that if Rabies vaccine is taken as 0,3,7,14,28 day schedule, it offers upto 10 years immunity. General population usually doesnt require boosters unless exposed to animal bite again. However, if you are working in high risk area like in a lab or with animals, I have following recommendations for you. 1. Consider receiving another booster dose 1  year after your 0 dose. Latest evidence suggests it improves immunity 2. At some intervals like yearly or perhaps once in 2-3 years, get you antibody levels done to check immunity levels. If levels are lower than recommended limit, get a booster 3. If you are exposed to rabies virus or if an animal suspected of rabies bites you, repeat 0,3 doses of vaccine to ensure adequate immunity. Hope this was helpful. You can read more on Rabies vaccine on CDC website.

HELLO, AS SUGGESTED PSM DEPARTMENT ONE YEAR.OK