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A diagnosticum contains

  • A.unknown antigen
  • B.unknown antibody
  • C.known antigen
  • D.known antibody

Answer: C

Correct answer: known antigen

A diagnosticum is a standardised preparation of known antigen - killed bacteria, or antigen coated on carrier particles - used to detect the corresponding antibody in a patient’s serum. It is the mirror image of a diagnostic serum.

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