The Success of a Universal Hepatitis B Immunization Program as Part of Thailand’s EPI after 22 Years’ Implementation
Fig 3
The prevalence of HBV assessed by seropositivity levels of HBsAg and anti-HBc and the seroprotective level of anti-HBs.
Individuals were divided into seven age groups (<5, 5–10, 11–20, 21–30, 31–40, 41–50 and 51–60 years plus). The proportions of individuals positive for HBsAg (A), anti-HBs (B), and anti-HBc (C) are shown on the y-axis. The age at which EPI began is denoted by a vertical line. The ‘before EPI’ group was defined as individuals > 22–24 years of age (depending on the province). The ‘after EPI’ group was defined as individuals < 22–24 years of age.