Immunology

: Retaining information from previous infections to prevent future illness.

: Utilizing immunotherapy to train the immune system to recognize and destroy tumor cells. Essay | Nature Reviews Immunology

The immune system is generally categorized into two interconnected systems: innate and adaptive immunity. Immunology

: An overreaction to harmless environmental substances.

: Distinguishing the host's own cells ("self") from foreign elements ("non-self"). : Retaining information from previous infections to prevent

: As the body’s first line of defense, the Innate Immune System is non-specific and immediate. It includes physical barriers like the skin and mucous membranes, as well as specialized cells like neutrophils and macrophages that engulf and destroy invaders through a process called phagocytosis.

: The ability to identify and fight off foreign infections. : An overreaction to harmless environmental substances

: Where the system mistakenly attacks "self" tissues.