IMMUNOLOGY

Immunity is defined as a defensive mechanism that protects the entire body system from foreign body. The immunity worked by detecting the foreign body and the get rid of it out of the body system, or non self material the find their way into the body without appropriate demand. Such foreign body could be an infectious material such as bacteria, virus, fungus etc, also the foreign body could also be as life saving tissue grafts. The immunity to the infection may be in the following; natural, acquired, or through adoptive immune response.

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DEFINATION OF TERMS

The study of the immunity is called immunology.

 Non-self: this defines a wide range, which include everything that is different from individual owns body constitution.  

Natural resistance: this is non-specific defense mechanism of the body system which is positioned against any foreign body without identifying it, this take place as a result of innate or natural immunity.

Adaptive Immune Resistance: this type of immune is mounted and directed to specific antibodies that might result to the destruction of this antibody in the body. It usually leave behind a memories of this antigen, so that it can be quickly identify and killed in the future, it also known as acquired immunity.

Vaccination: this is the method of stimulating adoptive immune response and memory against a known infectious agent without suffering from the harmful effects of the disease. In case of a feature contact with the same agent, the body can positioned immediate immune response due to acquired immunity.

Grafting: if cells or organs from one individual are used to replace defective ones in another individual, the body will later mount an immune response against them, recognizing them as no self. This is called Graft versus Host (GVH) reaction. 

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To suppress this undesired reaction, an immune mechanism is suppress by using drugs suppressing hormone until the body accept newly transplanted organ.