The immune system is a network of biological systems that protects an organism from diseases. It detects and responds to a wide variety of pathogens, such as viruses, bacteria, and parasites, as …

The overall function of the immune system is to prevent or limit infection. All immune cells come from precursors in the bone marrow and develop into mature cells through a series of changes that can …

Overview What is the immune system? Your immune system is a large network of organs, white blood cells, proteins and chemicals. These parts all work together to protect you from germs and other …

Nov 29, 2025 · immune system, the complex group of defense responses found in humans and other advanced vertebrates that helps repel disease-causing organisms (pathogens). Immunity from …

Mar 11, 2025 · The immune system is the body’s tool for preventing or limiting infection. Its complex network of cells, organs, proteins, and tissues enables the immune system to defend the body from …

It is a complex and integrated system of cells, tissues, and organs that has specialized roles in defending against foreign substances and pathogenic microorganisms, including bacteria, viruses, …

The immune system works to keep germs and other foreign substances out of the body and destroy any that get in. It's made up of a complicated network of cells and organs. It protects the body from …

The immune system distinguishes self from nonself and eliminates potentially harmful nonself molecules and cells from the body. The immune system also has the capacity to recognize and destroy …

Antigens are any substances that the immune system can recognize and that can thus stimulate an immune response. If antigens are perceived as dangerous (for example, if they can cause disease), …

Developed by the American Association of Immunologists and their expert members, Immunology Explained connects immunology to overall health, helping people understand its link to common …