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Discussion

A rising titre of IgG antibody is demonstrated by testing

  • A.acute-phase and convalescent-phase serum samples
  • B.a single sample taken at the onset of symptoms
  • C.a single sample taken after recovery
  • D.cerebrospinal fluid alone

Answer: A

Two samples taken at different points in the illness are compared, because a single IgG result cannot distinguish present infection from a past one. The comparison is what makes the rise, rather than the absolute value, the meaningful finding.

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