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Classification of hepatitis B virus (HBV) infection status based on the laboratory testing results.
| HBV infection status | Antibodies against HBV core antigen (anti-HBc) | HBV surface antigen (HBsAg) |
|---|---|---|
| Uninfected | Negative | N/A |
| Past infection (infection cleared) | Positive | Negative |
| Chronic infection | Positive | Positive |
N/A, not applicable. When calculating HBsAg prevalence, Anti-HBc Ab-negative participants were assumed to be HBsAg-negative.
