• Immunity is the ability of the body to fight against diseases.
• Infectious organisms that enters the body and produces toxins.
• These toxins are called antigens.
• The immune system of our body includes blood plasma, lymph and lymphocytes.
• These cells analyse the antigens and produce suitable protein substances called antibodies to kill the antigen in order to develop immunity.
Types of Immunity:
i) Natural or Innate Immunity: immunity present in the body since birth.
ii) Acquired or Specific Immunity: The immunity developed after birth against some
• Active acquired immunity: This kind of immunity is developed by our body, during the first infection of any pathogen. The antibodies produced in the blood remain for a long period and kill the similar pathogens.
• Passive Acquired Immunity: In this type of immunity, a ready-made antibody is given to develop immunity is introduced from outside, instead of stimulating the body to produce antibody with antigenic stimulus.
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