The following are the characteristics of acquired immunity.
(i) It is pathogen specific.
(ii) It is characterized by memory.
(iii) Responses can be characterized as a primary response of low intensity and an intensified secondary or anamnestic response.
Acquired immunity can be attained in the following ways :
(i) Active immunity : Here antibodies are produced in the host body in response to dead or liviing microbes or other proteins. Here onset of response in slow.
(ii) Passive immunity : Here ready made antibodies are directly given to product the body against foreign agents.
