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Discussion

The marker indicating acute hepatitis A infection is

  • A.IgG antibody to hepatitis A virus
  • B.hepatitis A surface antigen in serum
  • C.hepatitis A e antigen in serum
  • D.IgM antibody to hepatitis A virus

Answer: D

IgM appears with the illness and disappears over some months, so its presence dates the infection as recent. IgG persists for life and marks immunity, whether from past infection or from vaccination, and hepatitis A virus has no surface or e antigen of the kind hepatitis B carries.

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