The immune system is a sophisticated defense mechanism that protects the body from harmful pathogens like bacteria, viruses, fungi, and parasites. It's composed of various cells, tissues, and organs that work collaboratively to combat infections and diseases. The immune system can be broadly divided into two categories: innate immunity and adaptive immunity. Innate immunity is the body's first line of defense and includes physical barriers like skin and mucous membranes, as well as immune cells

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