Hepatitis B infection among adults in the philippines: A national seroprevalence study.

Aim: To determine the prevalence of hepatitis B surface antigen (HBsAg) seropositivity among adult Filipinos.

Methods: Testing for HBsAg was performed on serum samples from persons aged ≥ 20 years old who participated in the National Nutrition and Health Survey (NNHeS) conducted in 2003. Information on age, sex, marital status, educational attainment, employment status, and income were collected.