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Table 2 Case definitions to determine HBV infection and vaccination status

From: Improving the identification of priority populations to increase hepatitis B testing rates, 2012

Infection status
Unknown HBV status No history of HBV testing
Chronic hepatitis B HBsAg detected and/or HBV viral load detected
Immunity status
CHB-negative and HBV susceptible (not vaccinated and no evidence of natural immunity) HBsAg not detected and Anti-HBs not detected
CHB-negative and immune (vaccine-derived immunity or natural immunity) HBsAg not detected and Anti-HBs detected
CHB-negative with insufficient information to determine immunity status HBsAg not detected and Anti-HBs unknown
  1. HBsAg hepatitis B surface antigen, anti-HBs hepatitis B surface antibody, anti-HBc hepatitis B core antibody