Understanding Immunity and How it Fights Diseases

The video explains how vaccines help prevent diseases like smallpox and measles by building immunity. It defines immunity as the body's ability to fight infections through antibodies and cells. The immune response is triggered by antigens, which are harmful substances on pathogens. The immune system identifies and destroys these invaders. Lymphocytes, including B and T cells, play crucial roles. B cells produce antibodies, while T cells destroy pathogens. Various T cells, such as cytotoxic T cells, target dangerous cells.

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