Introduction: The tick-borne encephalitis (TBE) virus causes a dangerous neuroinfection in humans can serve as a model for studying the mechanisms of interaction of pathogens with specific antibodies during active and passive immunization. Several commercial vaccines are currently used against TBE. This review analyzes long-term studies aimed at explaining the active and passive efficacy of specific immunoprophylaxis against TBE. Methods: The effectiveness of "Encepur® adult" TBE vaccine has been studied in terms of seroconversion and strength of the immune response by serological reactions, namely IFA, ELISA and neutralizing were reviewed. Results: Rapid elimination of the virus (after 1-2 days) can occur in vaccinated individuals with antibodies in titers of more than 1: 400. Persons with antibodies in titers of 1: 100 and 1: 200, most likely, should be offered mandatory revaccination. It should also take into account the duration of the retention of post-vaccination antibodies. Conclusion: In the year of TBE vaccination, the immune response was at a high level and practically did not differ. A particularly high level of immune protection was observed in persons who were vaccinated by a combination of TBE vaccines of various producers.

Keywords: tick-borne encephalitis virus, vaccine prevention, passive immunization

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