Your immune system is your body’s first-line defense against invaders like germs. It helps protect you from getting sick and promotes healing when you’re unwell or injured. You can strengthen your immune system by eating nutritious foods, exercising and getting enough sleep.

Learn about the cells, tissues, function, and disease of the immune system, the body's tool for preventing or limiting infection. Find out how the immune system recognizes and responds to antigens, produces antibodies, and fights pathogens.

Immune system, the complex group of defense responses found in humans and other advanced vertebrates that helps repel disease-causing entities. Immunity from disease is conferred by two cooperative defense systems: innate immunity and acquired immunity. Learn more about the immune system’s mechanisms and evolution.

While researchers explore the effects of diet, exercise, age, psychological stress, and other factors on immune response, general healthy-living strategies can boost your immune system.

Learn how the immune system protects your child's body from germs and toxins, and how it has two main parts: the innate and the adaptive immune system. Find out how antibiotics help fight infections and when to use them.

The immune system is designed to defend the body against foreign or dangerous invaders. Such invaders include. Microorganisms (commonly called germs, such as bacteria, viruses, and fungi) Parasites (such as worms) Cancer cells. Transplanted organs and tissues.

The immune system is complex and pervasive. There are numerous cell types that either circulate throughout the body or reside in a particular tissue. Each cell type plays a unique role, with different ways of recognizing problems, communicating with other cells, and performing their functions.

The immune system has a vital role: It protects your body from harmful substances, germs and cell changes that could make you ill. It is made up of various organs, cells and proteins. As long as your immune system is running smoothly, you don’t notice that it’s there.

Learn about the immune system, its parts, functions and conditions. Find out how the immune system defends the body from infection, and what happens when it is underactive or overactive.