Differentiate between active immunity and passive immunity.

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Active immunityPassive immunity
It is produced due to contact with pathogen or antigen. It is produced due to antibodies obtained directly. 
 It lasts for a long time. It lasts for few days. 
Antibodies are produced by the body against the antigen.  Antibodies are obtained from other sources. 
Immunity is not immediate. There is a time lapse for the development. Immunity develops immediately. 
There are no or little side effects. The introduction of antisera can cause serum sickness.  
 The person is exposed to the agent.  The person is not exposed to the agent but is given the antibodies. 

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