How long will rabies post-exposure prophylaxis protect me for if got it last month? do i need boosters if i got scratched by a stray cat a month later

No need: Rabies vaccine, which is given along with rabies immune globulin for post exposure prophylaxis, will provide immunity for several years.

No: You are considered protected from exposure for 2 years after completion of the series. Those who work in high risk populations take it for protection. They are advised to get boosters after 2 years or a test to prove they still have protective antibody levels.