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A cell or chemical that triggers an immune reaction is called an antigen, and that reaction can be either innate or adaptive. The innate immune response produces an immediate, nonspecific immune response to disease-causing antigens that enter or appear inside the body. An army of scavenging white blood cells constantly roams around your body on the lookout for bugs; if a white blood cell detects an ‘enemy’, then it is immediately transported to the nearest lymph node, situated in your neck, armpits and groin, and destroyed without mercy. You can feel this process happening every time your glands become swollen because innate immunity also includes the inflammation or swelling process.

While the innate response is working on the front lines, the adaptive response system is quietly working behind the scenes to find a defence specifically tailored to deal with the antigen. Typically, the adaptive response takes about five to seven days to get completely mobilised; if the antigen works faster than that, you’re in trouble.