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A vaccine works by introducing a harmless version of a germ (like a weakened or dead virus, or just a piece of it) into the body. This tricks the immune system into thinking it’s under attack. The body then creates specific antibodies and memory cells to fight that particular germ. If the real germ ever invades later, the immune system recognizes it immediately and can destroy it quickly, preventing illness.
Parent Tip: Review the logic above to help your child master the concept of immune system worksheet.