immuniteedi

Immuniteet is a concept related to an organism's ability to resist a particular infection or toxin by the action of specific antibodies or sensitized white blood cells. This resistance is primarily achieved through the immune system, a complex network of cells, tissues, and organs that work together to defend the body against foreign invaders like bacteria, viruses, and parasites. When a pathogen enters the body, the immune system recognizes it as foreign and mounts a response to neutralize or eliminate it. This response can be immediate and general, known as innate immunity, or it can be slower and highly specific, called adaptive immunity.

Adaptive immunity is characterized by its memory. After encountering a pathogen, the immune system "remembers" it, allowing for a faster and stronger response upon subsequent exposures. This principle is the basis for vaccination, where a weakened or inactivated form of a pathogen is introduced to stimulate an immune response without causing disease, thus conferring immunity. There are two main types of adaptive immunity: active immunity, which is developed after exposure to an antigen (like a pathogen or vaccine), and passive immunity, which is acquired through the transfer of antibodies from another source, such as from a mother to her child or through medical treatments. Maintaining a robust immune system is crucial for overall health and well-being.