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 action when a host is attacked by a pathogen (viruses, bacteria, fungi, or parasites). These two systems work closely together and take on different tasks. The innate immune system is the body's first line of defense against intruders. It responds in the same way to all germs and foreign substances, which is why it is sometimes referred to as the "non-specific" immune system. The body has two immune systems: the innate immune system and the adaptive immune system . Innate immunity is an antigen-nonspecific defense mechanisms that a host uses immediately or within several … Innate immunity is the body’s first line of defense against pathogens, providing immediate, non-specific protection against a broad range of invaders. Unlike adaptive immunity , which targets specific pathogens with tailored responses, innate immunity acts quickly and uniformly upon encountering threats.
