Immunogenicity and Safety of Sanofi Pasteur's AVAXIM 80U Pediatric Vaccine Followed by Booster Dose

Inclusion Criteria : Inclusion criteria to be checked at the screening visit (SC): 1. Toddlers, children and adolescents: Sub-Group 1: from 12 months to 3 years of age on the day of inclusion Sub-Group 2: from 4 to 6 years of age on the day of inclusion Sub-Group 3: from 7 to 9 years of age on the day of inclusion Sub-Group 4: from 10 to 12 years of age on the day of inclusion Sub-Group 5: from 13 to 15 years of age on the day of inclusion 2. Screening informed consent form signed by the parent(s) or other legal representative for all the subjects and by the adolescents (sub-group 5 only) Inclusion criteria to be checked at the inclusion visit (V01): 1. Toddlers, children and adolescents: Sub-Group 1: from 12 months to 3 years of age on the day of inclusion Sub-Group 2: from 4 to 6 years of age on the day of inclusion Sub-Group 3: from 7 to 9 years of age on the day of inclusion Sub-Group 4: from 10 to 12 years of age on the day of inclusion Sub-Group 5: from 13 to 15 years of age on the day of inclusion 2. Inclusion informed consent form signed by the parent(s) or other legal representative for all the subjects and by the adolescents (sub-group 5 only) 3. Able to attend all scheduled visits and to comply with all trial procedures 4. Subject anti-HAV seronegative (IgG) according to the screening results (assay performed with local kit) 5. Subject HBsAg seronegative and ALT \<40 IU/l according to the screening results Exclusion Criteria : Exclusion criteria to be checked at the inclusion visit (V01): 1. Participation in another clinical trial in the 4 weeks preceding trial vaccination 2. Planned participation in another clinical trial during the present trial period 3. Congenital or acquired immunodeficiency, immunosuppressive therapy such as long-term systemic corticosteroids therapy 4. Systemic hypersensitivity to any of the vaccines components or history of a life-threatening reaction to the trial vaccines or a vaccine containing the same substances 5. Chronic illness at a stage that could interfere with trial conduct or completion 6. Blood or blood-derived products received in the past 3 months 7. Any vaccination in the 4 weeks preceding the trial vaccination 8. Any vaccination planned in the 4 weeks following the trial vaccination 9. History of hepatitis A infection (confirmed either clinically or serologically ) 10. Previous vaccination against hepatitis A with the trial vaccine or another hepatitis A vaccine 11. Thrombocytopenia or a bleeding disorder contraindicating intramuscular vaccination 12. History of /current seizures 13. Clinical or serological evidence of systemic illness including Hepatitis C and HIV 14. Febrile (axillary temperature ≥ 37.1°C) or acute illness