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In serodiagnosis of a viral infection, the antibody class appearing relatively rapidly after infection is

  • A.IgG
  • B.IgA
  • C.IgE
  • D.IgM

Answer: D

IgM appears early, so finding it suggests a recent or current infection and can support a diagnosis from one sample. IgG rises later and persists, which is why it is followed across two samples rather than read on its own.

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