Maybe lifelong but..: 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.
Answered 2/5/2018
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