system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A person who is HBsAg negative, Anti-HBs positive and Anti HBc positive, is most probably suffering from?
assistant
The correct answer is  HBsAg negative, Anti-HBs positive, Anti HBc positive means there is no surface antigen, which is the indicator of ongoing infection; but there is antibody against both the core and surface antigens. This shows that this person had an exposure to hepatitis B infection in the past and gained acquired immunity. Ref: The Encyclopedia of Hepatitis and Other Liver Diseases By James H. Chow, Cheryl Chow, 2006, Page 119.