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The immune system is a complicated association of organs, tissues, and cells that work together to protect the body. Inflammation is part of your body’s response when it feels it’s in danger of infection or further injury.

There are three kinds of immunity:

 Passive: Passive immunity is a temporary immunity that comes from another body, such as from the mother through the placenta or breast milk. Passive immunity typically disappears 6 to 12 months after birth.

 Innate: Innate immunity is the immunity you were born with. Innate immunity includes barriers that keep invaders from entering your body, as well as inflammatory responses — coughing; producing tears, sweat, mucus, and additional stomach acid; swelling; and so on.

 Acquired: Acquired immunity develops in the presence of certain antigens. It develops as your body builds defenses against specific invaders, such as viruses that cause chicken pox and the common cold.

In this section, we cover innate and acquired immunity, the two immune systems that stick around through adulthood. We discuss inflammation as part of the innate immune system, and we cover the invader-specific defenses of the acquired immune system.