This second edition of the popular electronic textbook has been thoroughly revised for 2020. Three new chapters have been added to cover recent progress in Tumour Immunology, Tumour Immunotherapies and Industrial Immunology. The remaining chapters have also been updated to include the latest advances in topics such as innate lymphoid cells and inflammasome activation. The book aims to introduce and explain each of the major aspects of human immunology that are likely to be covered during undergraduate courses in immunology. It should also be of particular benefit to students of biology, medicine and microbiology. With 21 chapters and over 100 full colour figures, each topic begins with a simple explanation of the basic concepts, and progresses in a step-wise and easily followed manner towards quite advanced topics later in the book. A self-assessment section featuring over 200 questions and answers is also included as an aid to revision, and to help gauge understanding of the material presented in each chapter. The book has been optimised for reading on tablets and other mobile devices, such as mobile telephones, tablets, kindles and other e-readers. In particular, the text and images are optimised to be easily accommodated and viewed on smaller devices. The book is also enabled for electronic text-to-speech conversion, so if your device offers this function, it should be possible to listen to the book as an aid to revision. Contents Chapter 1: Introduction to immunology, the challenges and the requirements Chapter 2: Introduction to cellular and molecular biology Chapter 3: Cells and tissues of the immune response Chapter 4: Innate immunity and pattern recognition Chapter 5: Inflammation Chapter 6: Overview of adaptive immunity Chapter 7: Lymphocyte subsets and development Chapter 8: Antibodies and the humoral response Chapter 9: Presentation to T-cells Chapter 10: Genetic the key to adaptive immunity Chapter 11: B-cell activation Chapter 12: T-cell activation and cell-mediated immunity Chapter 13: Immunological memory and vaccination Chapter 14: Immunological tolerance and transplantation Chapter 15: Mucosal and cutaneous immunity Chapter 16: Immune responses to major pathogens Chapter 17: Hypersensitivities and allergy Chapter 18: Tumour immunology Chapter 19: Tumour immunotherapies Chapter 20: Methods in immunology Chapter 21: Industrial immunology 210 self-test questions and answers