What is the immune system? The immune system is what protects your body from diseases and infections. It's the bodily system that produces the immune response to defend your body from …

Your immune system is a network of organs, white blood cells, proteins and chemicals that work together to protect you from invaders (like germs) that can harm you.

Apr 13, 2026 · The immune system is a group of defense responses found in humans and other advanced vertebrates that helps repel disease-causing entities. Immunity from disease is conferred …

Many species have two major subsystems of the immune system. The innate immune system provides a preconfigured response to broad groups of situations and stimuli. The adaptive immune system …

The adjective immune comes from the Latin word immunis, which means “exempt from public service.” If you're protected — or exempt — from disease, injury, work, insults, or accusations, then you're …

The body has a collection of physical barriers to prevent infection, but once these are overcome, we rely on our immune systems to protect us against a wide variety of infections.

Feb 18, 2026 · The immune system defends the body from invaders such as viruses, bacteria, and foreign bodies. Find out how it works, what can go wrong, and how to boost immune health.

Apr 13, 2025 · The immune system is a vast, interconnected network of organs, cells, and molecules that protects your body from harmful substances, pathogens (like bacteria, viruses, and fungi), and …

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.

To do its job, your immune system needs to be able to tell what does and doesn't belong in your body. That way it knows which things to fight off and which to leave alone.