The antigen-antibody reaction is a specific chemical interaction between antibodies produced by B cells and antigens, forming the basis of antibody-mediated immunity. Each antibody can only bind to a specific antigen at the antibody binding site on the antigen known as the epitope. There are three main types of antigen-antibody reactions: precipitation, agglutination, and complement fixation. The reaction is highly specific, non-covalent, and reversible. It has applications in determining blood groups, detecting proteins, and characterizing immunodeficiency diseases.

1. Antigen and Antibody
Reaction

2. INTRODUCTION:
- antigen-antibody reaction, is a specific chemical
interaction between antibodies produced by B cells
of the white blood cells and antigens during
immune reaction.
- these form the basis for hormonal immunity or
antibody mediated immunity, and these reactions
form the basis for detection of infection disease
causing agents and also some nonspecific Ag's like
enzymes

3. each antibody has the ability to
bind to a specific antigen only
- An epitope is the part of an
antigen that the host’s immune
system recognizes, mean that it
is the antibody binding site

4. Types of antigen-antibody
Reaction :
1- precipitation reaction
2- agglutination reaction
3- complement fixation

5. Propreties of antigen-antibody
Reaction :
-- highly specific Reaction
– Non-covalent interaction
– Reversible
-- cross - reactivity

6. Application of antigen -antibody
Reaction :
Some of achief uses of antigen-antibody Reaction
are :
1- Determination of blood groups for transfusion.
2- to detect the presence or absence of protien in
serum.
3- determining the Characteristic of certain
immunodeficiency disease.

7. Thanks