Which of the following provides the sites for the interaction of lymphocytes with the antigen, which then proliferate to become effector cells?

  • A
    Thymus
  • B
    Spleen
  • C
    Bone marrow
  • D
    All of the above

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$A$: $ELISA$ is based on the principle of antigen-antibody interaction.
$B$: In $ELISA$,infection by a pathogen can be detected by the presence of antigens or by detecting the antibodies synthesized against the pathogen.

$DPT$ vaccine provides immunity against which of the following?

Pasteur and Koch are related to

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