Characters of acquired immunity are

Options

A. Specificity of antigen
B. Difference between self and non-self
C. Retains memory
D. All of these

Answer

D

Explanation

(d) Acquired immunity is obtained during the life of an individual to a particular micro-organism due to previous infection, vaccination or inoculation of antiserum. It has four unique characteristics :
(i) Specificity: It is specific for each & every type of pathogen.
(ii) Diversity : It operates against the whole diversity of pathogenic organisms, their toxins & pollutants.
(iii) Difference between self & non-self : It can differentiate molecules & cells of foreign origin from those of self.
(iv) Memory : the immunity against a pathogen developed during an initial infection is retained by the individual so that second encounter with the pathogen invites a heightened immune response.