Long Term Immunity and Safety Following Vaccination With the JEV IC51 (IXIARO®, JESPECT®) in Pediatric Population In Non Endemic Countries. Uncontrolled, Ph3 FU-Study

Inclusion Criteria: * Subjects who have received two vaccinations in study IC51 322. (2) Subjects who were enrolled as part of the immunogenicity subgroup of study IC51-322. * Male or female healthy subjects aged ≥ 9 months to \< 21 years at the time of enrolment into this study. * Written informed consent by the subject, the subject's legal representative(s), according to local requirements, and written informed assent of the subject, if applicable. Exclusion Criteria: * History of or clinical manifestation of any Flavivirus disease during study IC51-322. * Vaccination against JE virus (JEV) (except with IC51) at any time prior or planned during this study. * Participation in another study with an investigational product during study IC51-322 or IC51-324. * History of or development of any immunodeficiency including post-organtransplantation after inclusion into study IC51-322. * History of or development of an autoimmune disease during study IC51-322. * Administration of chronic (defined as more than 14 days) immunosuppressants or other immune-modifying medications started during study IC51-322 up to first visit of study IC51-324. (For corticosteroids this means prednisone or equivalent at \>= 0.05 mg/kg/day. Topical or inhaled steroids are allowed). * Known infection with human immunodeficiency virus (HIV), hepatitis B virus (HBV) or hepatitis C virus (HCV). * Illicit drug use and/or a history of drug or alcohol addiction and/or current drug or alcohol addiction. * Inability or unwillingness by the legal representative(s) and/or the subject (where applicable) to provide informed consent/assent and to abide by the requirements of the study. * Persons who are committed to an institution (by virtue of an order issued either by the judicial or the administrative authorities).