How long does the rabies vaccine last in humans?

Uncertain: We really are not 100% certain. Cdc feels--if high risk--test every 2 years (e.g. Vet working in rabies zone) latest who consensus is every 10 years. In general, if continued risk, recommend periodic retesting titers though immunity may persist even when antibodies are no longer detectable. Cdc rule? If the titer.

At least 2yr: After completion of a pre-exposure vaccine series, the protective antibody level lasts for at least 2 years. Boosters are only recommended if a serum titer has dropped. People with continuous exposure are advised to have titers done every 6 mo while those with occasional exposure should be tested every 2 yrs.