A patient is positive for hepatitis B surface antigen and for IgM antibody to hepatitis B core antigen. How should this pattern be interpreted?
1Immunity from vaccination
2Acute hepatitis B infection✓ 정답
3Chronic hepatitis B infection
4Resolved past infection
해설
A positive surface antigen indicates current infection, and IgM antibody to the core antigen indicates recent infection. Together they define acute infection. In chronic infection the core antibody has switched to IgG, and in vaccine-induced immunity only the surface antibody is positive.