Immunization

@z_graeden here's the continuation of the Articles about *IMMUNITY*

Immunization is the process whereby a person is made immune or resistant to an infectious disease, typically by the administration of a vaccine.

Vaccines stimulate the body's own immune system to protect the person against subsequent infection or disease.

When this system is exposed to molecules that are foreign to the body, called non-self, it will orchestrate an immune response, and it will also develop the ability to quickly respond to a subsequent encounter because of immunological memory. This is a function of the adaptive immune system. Therefore, by exposing an animal to an immunogen in a controlled way, its body can learn to protect itself: this is called active immunization.

The most important elements of the immune system that are improved by immunization are the T Cells, B Cells, and the antibodies B cells produce. Memory B cells and memory T cells are responsible for a swift response to a second encounter with a foreign molecule. Passive immunization is direct introduction of these elements into the body, instead of production of these elements by the body itself.