Passive immunity can be achieved from

Passive immunity can be conferred directly by

Artificial immunity can be acquired from a ---

Active immunity can be produced by

Select the correct statements regarding the characteristics of acquired immunity. (i) Cell-mediated immunity is responsible for acquired immunity. (ii) It produces a primary response of low intensity. (iii) Active and passive immunity are types of acquired immunity, (iv) Polymorphonuclear leucocytes and natural killer cells are involved in acquired immunity.

Active immunity means:

Passive immunity was discovered by :

How acute immunity can be obtained?

Explain immunity.