The innate immune system or nonspecific immune system[1] is one of the two main immunity strategies in vertebrates (the other being the adaptive immune system).

The innate immune system is a subset of the human immune system that produces rapid, but non-specific responses to pathogens. Unlike the adaptive immune system, the innate system does not …

Aug 5, 2025 · Innate immunity is the body’s first line of defense. It is ancient, fast, and brutally efficient. From the moment you are born—and in fact, even before—you possess an inborn arsenal of …

Innate immunity serves as a global surveillance system, sensing external stimuli and assessing cellular fitness to initiate context-specific responses that combat infections and maintain tissue homeostasis.

Jan 25, 2021 · In contrast to adaptive immune responses, which take days to arise following exposure to antigens, innate immunity consists of the defenses against infection that are ready for immediate …

When pathogens enter the body, the innate immune system responds with a variety of internal defenses. These include the inflammatory response, phagocytosis, natural killer cells, and the complement …

Infected host cells release chemokines in order to initiate an immune response, and to warn neighboring cells of the threat. The innate immune system is made of defenses against infection that can be …

Our innate immune system is almost fully developed when we are born, unlike the adaptive immune system, which develops later and grows with us as we age and encounter new infections over time. …

Apr 29, 2025 · Innate immunity serves as the body’s first line of defense against pathogens, offering a rapid response to invading microorganisms. Unlike adaptive immunity, which tailors its response over …

Innate (natural) immunity is so named because it is present at birth and does not have to be learned through exposure to an invader. It thus provides an immediate response to foreign invaders. …