IMG_0007 - A ACTTYE II'IMUNITY AND THE CLONAL SELECTION...

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A) ACTTYE II\'IMUNITY AND THE CLONAL SELECTION THEORY: When a person is exposed to a pthoge4 there is a latent period of 5 to 10 days before measurable amounts of specific antibodies appear in the blood. This primary response may not be sufficient to prctect against the disease. A subsequent exposure of the same individual to the same antigen results in a secondary response, where antibody pro&rction is much rapid Maximum antibody concentration in the blood are reached in less than 2 hours and maintained for a longer time than rn the primary response. This rise in production prevents the disease. 1. CLONAL SELECTION THEORY: The procedures of Jenner and Pasteur were effective because the people who were inoculated produced a secondary rather than a primary response when exposed to the virulent pathogens. Immunizations produce a tlpe of "learningl' in which the abilit_v of the immune system to combat a prticular pathogen is improved by prior exposure.
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