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Welcome to eGyanKosh’s Unit-22: Immunity and Some Human Diseases, your comprehensive study resource for IGNOU 2025. This unit delves into the intricacies of the human immune system and its vital role in combating various diseases. Designed for students and learners alike, it offers an in-depth exploration of immune mechanisms, disease prevention, and the impact of pathogens on human health. Here, you can access high-quality study materials, available for free download, ensuring that you have all the tools necessary to excel in your academic journey. Whether you are preparing for exams or seeking to enhance your understanding of immunology, this resource is tailored to meet your educational needs.