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Immunology
The Immune Response
The Immune Response
Antigens
Microbes
Toxins
Chemicals
Drugs
Consequences
 Beneficial
 Indifferent
 Injurious
The Immune Response
Characteristics of Immune Responses
1. Antigenic Specificity
2. Diversity
3. Immunologic Memory or Anamnesis
4. Self/ Non self Recognition
The Immune Response
Components of Immune System
1. Humoral (Antibody mediated)
2. Cellular (Cell mediated)
Humoral
(Antibody mediated)
Humoral (Antibody mediated)
Different types of antibodies found in Humors
Humoral
(Antibody mediated)
Production of Antibodies
Humoral
(Antibody mediated)
Characteristic curve:
1. Lag Phase
2. Log Phase
3. Plateau Phase
4. Decline Phase
Humoral
(Antibody mediated)
β Cell and Humoral response
Activation by Lymphokines secreted by T cell and
antigens
Two types of cells
Memory cell
Effectors cells
Cellular (Cell mediated)
T-Cell and cell mediated response
Cellular (Cell mediated)
β Cell and Humoral response
Activation by Lymphokines secreted by T cell and
antigens
Two types of cells
Memory cell
Effectors cells
Cellular (Cell mediated)
Mechanism I
Cellular (Cell mediated)
Mechanism I
Cellular (Cell mediated)
Primary Vs Secondary
Immunity
S.N. Primary immune response Secondary immune response
1.
This occurs as a result of primary
contact with an antigen.
This occurs as a result of second and
subsequent exposure of the same
antigen
2
Responding cell is naïve B-cell and T-
cell.
Responding cell is memory cell.
3
Lag phase is often longer (4-7 days),
sometimes as long as weeks or months.
Lag phase is shorter (1-4 days) due
to the presence of memory cell.
4
Level of antibody reaches peak in 7 to
10 days.
Level of antibody reaches peak in 3
to 5 days.
5
It takes longer time to establish
immunity.
Takes shorter time to establish
immunity
Primary Vs Secondary
Immunity
6
First antibody produced is mainly IgM.
Although small amount of IgG are also
produced.
Mainly IgG antibody is produced.
Although sometimes small amount of
IgM are produced. Other
immunoglobulins such as IgA and in
the case of allergy IgE are produced.
7
Amount of antibody produced depends on
nature of antigen. Usually produced in
low amount.
Usually 100-1000 times more
antibodies are produced.
8 Antibody level declines rapidly.
Antibody level remain high for longer
period.
9.
Affinity of antibody is lower for its
antigen.
Antibodies have greater affinity for
antigen.
10
Primary response appears mainly in the
lymph nodes and spleen.
Secondary response appears mainly in
the bone marrow, followed by the
spleen and lymph nodes.

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Introduction to immune respose .pptx