specific immunity

Acquired or adaptive (specific) immunity
The resistance, which absent at the time of first exposure to a pathogen, but develops after being exposed to the pathogen is called acquired immunity. It includes specific cells of the immune system that ate able recognize and response to the foreign materials. The cells involved in this type of immunity are lymphocytes both T and B cells.
Properties of acquired or adaptive (specific) immunity
Also known as acquired immunity, resist a particular foreign agents, moreover, specific immune response improve on repeated exposure to the same agents, many characteristic distinguish specific immunity from non- specific immunity:
1. Specificity: specific activity for each type of pathogens. Immunity is directed against a particular pathogen or foreign substance.
2. Memory: when exposed to the same pathogen or substance the body reacts so quickly that there is no notice able pathogenesis, Recognition to the specific sites on the foreign substances (Ag) needs at first a certain time so innate immunity is faster than specific immunity but the later is more effective and the program of the solid immunity against infectious disease depend on the activation of specific immunity. Response results in immunologic memory very important characteristic feature that the concept of vaccination depends on