Summary
Immunology deals with a study of the immune
system. The immune system recognises and eliminates the invaders, and the
ability of the body to overcome the pathogen is called immunity. Immunity is
classified into innate immunity and acquired immunity. Acquired immunity is
further classified into cell mediated immunity and antibody mediated immunity
as its components. Acquired immunity may be active or passive immunity. Immune
response is the body’s response to pathogens and it may be primary or
secondary. The organs involved in the origin, maturation and proliferation of
lymphocytes are called lymphoid organs. Thymus, bone marrow are primary
lymphoid organs. The secondary lymphoid organs are lymph node, MALT, GALT and
BALT.
An antigen is a substance that is specific to an
antibody. An immunogen is a substance capable of initiating an immune response.
Haptens are substance that are non-immunogenic but can react with the product
of a specific immune response. Substances that can enhance the immune response
to an antigen are called adjuvants. An epitope is also known as antigenic
determinant and is the active part of the antigen. A paratope is the part of
antibody. Precipitation, agglutination, neutralization, opsonisation etc. are
the different types of antigen and antibody reaction. A vaccine is biological
preparation that provides active acquired immunity. The malfunctioning of
immune system leads to hypersensitivity, immunodeficiency or autoimmune
diseases. A tumour or neoplasm is a group of cells whose growth has gone
unchecked. The best results in the treatment of cancer is achieved by an
integrated approach to therapy, surgery, radiotherapy, chemotherapy and
immunotherapy.
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