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Discussion

IgM antibody to the hepatitis B core antigen indicates

  • A.immunity following vaccination
  • B.an infection resolved many years ago
  • C.the absence of any past exposure
  • D.recent or acute infection

Answer: D

Correct answer: recent or acute infection

IgM is the first class of antibody made and it wanes over a few months, so IgM anti-HBc points to infection within roughly the last six months. IgG anti-HBc persists for life and shows only that infection occurred at some time, which is why the two classes must be distinguished.

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