[Simultaneous detection of HBs antigens and antibodies: report of a case]

We reported the case of a young woman who presented simultaneously HBs antigen and HBs antibodies in blood. From historical datas, we suspected that the patient was infected by hepatitis B virus and developed a chronic infection. Lately, she received hepatitis B vaccine. Subtypes of the infectious hepatitis B virus and the immunogenic hepatitis B antigen were different and induced independent immunological responses.