Every day, your immune system defends your body against countless bacteria, viruses and other invaders, largely without you noticing.Every day, your immune system defends your body against countless bacteria, viruses and other invaders, largely without you noticing. This book explains how that defense works, from the first physical barriers like skin and mucous membranes to the coordinated response of white blood cells, antibodies and the lymphatic system. You will learn how your body recognizes threats, how inflammation and fever contribute to healing, and how vaccines help your immune system prepare for future infections. The book also addresses common questions about allergies, autoimmune conditions and what you can do to support your immune health. This book was generated using artificial intelligence and offers a clear, accessible introduction to the science behind your body's natural defense system, written for readers without a medical background.Every day, your immune system defends your body against countless bacteria, viruses and other invaders, largely without you noticing. This book explains how that defense works, from the first physical barriers like skin and mucous membranes to the coordinated response of white blood cells, antibodies and the lymphatic system. You will learn how your body recognizes threats, how inflammation and fever contribute to healing, and how vaccines help your immune system prepare for future infections. The book also addresses common questions about allergies, autoimmune conditions and what you can do to support your immune health. This book was generated using artificial intelligence and offers a clear, accessible introduction to the science behind your body's natural defense system, written for readers without a medical background.