VACCINATION | small pox variola vaccine |hepatitis-B vaccine |vaccine

 VACCINATION

      • In vaccination, a preparation of antigenic proteins of pathogen or

inactivated/weakened pathogen (vaccine) are introduced into the body.

      • The antibodies produced in the body against these antigens would

neutralise the pathogenic agents during actual infection.
       

       • The vaccines also generate memory – B and T-cells that recognise the

pathogen quickly on subsequent exposure and kill the invaders with a

massive production of antibodies.
     

  Production of large scale of vaccine become possible through DNA

recombinant technology which allowed the production of antigenic

polypeptide(vaccine) in bacteria and yeast.
   

Hepatitis B vaccine is produced from yeast through DNA recombination

technology for large scale immunisation.