Immune System


PROPERTIES OF ACQUIRED IMMUNITY



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Bog'liq
Immun Reaktivlik

PROPERTIES OF ACQUIRED IMMUNITY

  • Specific-Acquired immunity is highly specific; directed against specific antigens that are unique to the microbes.
  • Memory present- A proportion of T and B cells become memory cells following primary contact of the microbe, which play an important role when the microbe is encountered subsequently.
  • Diversity is wide- Acquired immunity though takes time to develop is active against a wide range of repertoire of antigens.
  • Host cell receptors of acquired immunity are specific for particular microbial antigen-

Types of Acquired immunity

Differences between active and passive immunity

  • Active immunity
  • Passive immunity
  • Produced actively by host immune system
  • Immunoglobulins received passively
  • Induced by
  • Infection (natural)
  • Vaccination (artificial)
  • Acquired by-
  • Mother to fetus IgG transfer (natural)
  • Readymade antibody transfer (artificial)
  • Lasts for short time
  • Lag period present
  • Memory present
  • No Memory
  • Booster doses-useful
  • Subsequent doses-Less effective
  • No Negative phase
  • In immunodeficiency individuals not useful

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