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Immunity refers to the body's ability to resist or defend itself against harmful invaders, such as pathogens (bacteria, viruses, fungi), toxins, and other foreign substances. It involves a complex network of cells, tissues, and organs that work together to detect, neutralize, and eliminate these harmful agents. The immune system is categorized into innate immunity, which provides immediate, nonspecific defense, and acquired immunity, which develops over time and is specific to particular pathogens.

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