This book examines the development and applications of system biology approaches for the prevention, diagnosis, and understanding of disease mechanisms. It explores the applications of system biology in infectious diseases, including host-pathogen interaction, and the identification of targets for new therapeutics and intervention strategies. It covers the use of system biology for understanding and treating metabolic disorders towards personalized and precision medicine. The book further discusses the systems biology approaches for understanding the mechanisms of tumor progression and designing more effective cancer therapies. The chapter also reviews the current strategies in autoimmune disease treatment and highlights the opportunity that systems biology represents for the development of better and safer treatments. Importantly, the book discusses the current state of the systems-level understanding of diseases and both the therapeutic and adverse mechanisms of drug actions usingsystem biology approaches. Cutting across the disciplines, this book is a valuable source for researchers in genetics, molecular biology, cell biology, microbiology, and biomedical sciences.​