This Study Will Evaluate the Persistence of Hepatitis A Antibodies, 8 Years and 10 Years Later, in Children Who Had Received Havrix at Selected Health Centres of Panama

The purpose of this study is to evaluate the persistence of hepatitis A antibodies, approximately 8 years and 10 years post vaccination with the complete series of Havrix (2 doses) and the partial series completion (1 dose).

The study comprises of two independent cross-sectional surveys (Year 8 and Year 10). The first cross-sectional serosurvey will evaluate the long term persistence of immunity approximately 8 years post vaccine administration and the second cross-sectional study will evaluate long term persistence, approximately 10 years post vaccine administration.