Long Term Persistence and Effect of a Booster Dose of the Japanese Encephalitis Vaccine IC51

Long Term Persistence and Effect of a Booster Dose of the Japanese Encephalitis Vaccine IC51

The study investigates the long term persistence the Japanese encephalitis vaccine IC51 and the need of a booster dose

This is an open label, non-randomized multi-center phase 3 follow-up study. All volunteers having completed trial IC51-304 (NCT00595790) will be enrolled into this trial at 2 sites

Inclusion Criteria:

• At least 18 years of age
• Written informed consent obtained prior to study entry
• Subjects correctly included in and having completed study IC51-304 according to the protocol.

Exclusion Criteria:

• Use of any other investigational or non-registered drug or vaccine in addition to the study vaccine during the study period
• Immunodeficiency including post-organ-transplantation or immunosuppressive therapy
• Pregnancy, lactation or unreliable contraception in female subjects