Safety and Tolerability of the Japanese Encephalitis Vaccine IC51

Inclusion Criteria: * At least 18 years of age * Written informed consent obtained prior to study entry Exclusion Criteria: * Use of any other investigational or non-registered drug or vaccine in addition to the study vaccine during the study period or within 30 days preceding the first dose of study vaccine * History of any previous JE vaccination (e.g. JE-VAX®) * Immunodeficiency including post-organ-transplantation or immunosuppressive therapy * A family history of congenital or hereditary immunodeficiency * History of autoimmune disease * Any acute infections within 2 weeks prior to enrollment * Known or suspected HIV Infection * Pregnancy, lactation or unreliable contraception in female subjects