Antibody titers after tick-borne encephalitis (TBE) vaccination are less in elderly and vaccination breakthroughs are more common in this age group. This has prompted Swedish authorities to recommend an additional dose in the initial vaccination schedule (= 0+30+90 days instead of the usually recommended 0+30 days. The investigators intend to evaluate this regime.
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Serum concentration of neutralising antibodies against TBE one month after two or three doses.
Timeframe: 18 months after the first dose