Question

(i) List any two situations, when a medical doctor would recommend an injection of preformed antibodies into the body of a patient. Name this kind of immunization and mention its advantages.
(ii) Name the kind of immunity attained when instead of antibodies, weakened antigens are introduced into the body.

Answer 1

(i)A doctor would recommend preformed antibodies in an injured person in an accident on snake bites and tetanus. The type of immunization is passive immunization.
Its advantages are:
(a)Provides immediate relief.
(b)Used either prophylactically or therapeutically.
(ii)This type of immunity is called active immunity. In this, the preparation of antigenic proteins of pathogen or inactivated/weakened pathogens (vaccine) are introduced into the body. It is a slow process as takes time to develop antibodies against the antigen