“ As the tick feeds on the vaccinated person, these antibodies are ingested by the tick as part of its blood meal. Binding of vaccine-induced antibodies to OspA on Borrelia inside the tick inhibits the bacterium’s ability to leave the tick”

What an odd mechanism of action. I did not see any mention of long-term efficacy for something that would require our blood serum to have. I imagine, indefinitely, a significant amount of antibodies circulating in our blood.