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  Immunity

Immunity:

Disease spreads from one person to other person is termed as infectious disease. Infectious diseases are influenced through foreign substances such as fungi, bacteria, virus / parasite, while they enter in to the human body. However the disease through such pathogen influences the body for a shorter time period, the person might survive after losing functions of a number of the organ (for example- Poliomyelitis). Occasionally, while the infection or disease is harsh the person has to die. Yet several of the human beings are able to lead a usual life because of the immune system. The immune system gives such freedom enjoyed from an individual, in order to maintain them free from diseases.

The immune system comprises the subsequent the functions,

1. Recognition and defence in opposition to foreign substances (antigen) irrespective of the route of entry.

2. Depending on the nature of the pathogen, suitable immune reaction is mounted.

3. The antigen induced Antibody combine particularly to that antigen (Specificity)

4. Immune system keeps memory regarding to the pathogens and while the same pathogen re-enters a better immune response is generated. This forms the basis of vaccination.

5. Recognition and destruction of the mutant cells which can become cancerous and this is termed as Immunosurveillance.

6. Generally, Immune system does not generate antibodies against its own body tissues (self antigens), termed as Immune tolerance or Self recognization.

Depending upon the nature of response in the direction of the pathogen, Immune system is generally categorized into Natural and Acquired immunity. Immune system is categorized as follows.

645_classification of immunity.jpg

 

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