By John Gordon
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Sample text
Innate or natural immunity is the resistance shown on the first encounter between a particular host species and a particular species of parasite, before the forces of acquired immunity are mobilized. The basis of this immunity is not clear but includes the mechanism of non-specific resistance as well as "natural antibodies". Their absence from germfree animals suggest they are a form of acquired immunity to cross reacting antigens. The other answers are all examples of acquired immunity. Natural recovery in lobar pneumonia when defervescence dramatically takes place by crisis from 7th—10th day is due to the sudden acquisition of protective levels of pneumococcal antibody by natural active immunity.
N. O. P. Accelerated graft rejection by second set reaction. Enhanced resistance effected by booster immunization Hyperimmunization by repeated antigenic stimulation Secondary or anamnestic antibody response Specific antibody-induced suppression of graft rejection. 19 Which lymphoid tissue is rarely if ever the site of germinal centres and antibody production in the absence of disordered function? Q. R. S. T. U. Lymph node Peyer's patches Spleen Thymus Tonsil. 20 When serum from a sensitized donor is injected intradermally into a non-sensitized recipient and after a latent period greater than one day an injection of the same antigen into the same site elicits within minutes localized weal and flare reaction, which class of antibody is specifically associated with the reaction?
Thus instead of enhancing resistance, tolerance will increase susceptibility to progressive infection or will allow establishment of prolonged latent infection with organisms of low virulence. The other answers all refer to components of the specific immune response which are active in protection against infection. 18 The term "immunological enhancement" has a specific meaning. Which one of the following refers to this phenomenon? L. M. N. O. P. Accelerated graft rejection by second set reaction.
