Types of Immunity

1. Immunity
Definition and types
Dr. K.Kamatchi
Assistant Professor
Department of Zoology
Vivekananda College
Tiruvedakam West

2. Synapsis
Immune System – Definition
Comparison - Immune system – Defense Forces.
Immunity – Definition
Types of Immunity
 Innate Immunity.

3. Immune System
•Defence against infection –
system
•Formed of Lymphoid
organs and immune cells.

4. Immune System and Defence Forces
• Pathogens - Enemies
• Immune response - Operation of War.
• Site of infection - War field.
• Bone marrow - Army head quarter.
• Thymus, Spleen, Lymph node - Training Centres.
• Immune cells - Soldiers.
• Antigen Presenting Cells - Sentries.
• Antibodies, Complements - Arrows and bullets.

5. Major Targets of Defence System
Bacteria
Viruses
Fungi
Protozoans
Helminth Worms
Worn out Cells – RBC
Tissue debris – Injury
Cancer Cells

6. Immunity
•Resistance to Infection.
•Recognition and disposal
of non-self or foreign body.

7. Layered Defence
Physical Barriers – Skin, Coughing, Sneezing –
first line of defense.
Innate Immunity – obtained – birth – natural
defense.
Acquired Immunity – developed – during life
Immunological memory

8. Innate Immunity
 Resistance obtained – birth
 Natural defense
 Inherited – parents – young ones.
 Non- specific.
 General protective reaction – against any invasion.
 Effective – wide range of infectious agents.

9. It operates through following factors
Physical and Mechanical Factors
Biochemical Factors
Cellular Factors
Genetic Factors
Body Temperature
Inflammation
Fever

10. Physical and Mechanical Factors
Skin
Horney outer layer –
stratum corneum.
Impermeable – microbes –
mechanical barrier.
Loss of skin – burns –
infection – quickly.

11. Physical and Mechanical Factors
Mucous Membrane
Lining – opening – body
Traps – microbes – skicky
nature