The purpose of the present trial is to assess the safety, reactogenicity and immunogenicity of adjuvanted hepatitis B vaccine, Engerix™-B and hepatitis B vaccine new formulation when administered at 0, 6 months

At the time of conduct of this study, the sponsor GlaxoSmithKline was known by its former name SmithKline Beecham

Inclusion Criteria:

• Between 18 and 40 years old.
• Written informed consent will have been obtained from the subjects.
• Good physical condition as established by physical examination and history taking at the time of entry.
• Female participants will avoid becoming pregnant during the study period and they will have been on a contraceptive program for at least 2 months before entry

Exclusion Criteria:

• Pregnancy or lactation.
• Positive titres for anti HBs antibody.
• Any vaccination against hepatitis B in the past.
• Any previous administration of MPL.
• Elevated serum liver enzymes.
• History of significant and persisting hematologic, hepatic, renal, cardiac or respiratory disease.
• Axillary temperature > 37.5°C at the time of injection.
• Any acute disease at the moment of entry.
• Chronic alcohol consumption.
• Any treatment with immunosuppressive or immunostimulant therapy.
• Any chronic drug treatment, which in the investigator's opinion, precludes inclusion into the study.
• History of allergic disease likely to be stimulated by any component of the vaccine.
• Simultaneous administration of any other vaccine(s).
• Administration of any immunoglobulin during the study period.
• Simultaneous participation in any other clinical trial.