Chapter 1: Introduction to Hansen's disease -- Chapter 2: The journey to a scientific understanding of leprosy: a brief outline -- Chapter 3: The origin, evolution and history of leprosy through a paleopathological lens -- Chapter 4: Hansen's disease and Human Rights -- Chapter 5: Leprosy agents and principal methods of detection, identification and characterization of the leprosy agents -- Chapter 6: Epidemiology of Hansen's Disease -- Chapter 7: Hansen's Disease and One Health -- Chapter 8: Metabolic, genetic and immunological mechanisms in susceptibility to leprosy -- Chapter 9: Clinical aspects and classification of Hansen's disease -- Chapter 10: Reaction in Hansen's disease -- Chapter 11: Hansen's disease in children -- Chapter 12: Neuropathophysiology in Hansen's disease: mechanisms of nerve injury -- Chapter 13: Neurological manifestations -- Chapter 14: Evaluation, monitoring, and prevention of disabilities in Hansen's disease -- Chapter 15: Ophthalmological alterations in Hansen's disease -- Chapter 16: Ear, nose, throat and mouth alterations in Hansen's disease -- Chapter 17: Osteoarticular alterations in Hansen's disease -- Chapter 18: Diagnostic Imaging in Hansen's Disease: Conventional Radiography, Computed Tomography, Magnetic Resonance Imaging, and Dual-energy X-ray Absorptiometry -- Chapter 19: Coinfection and immunosuppression in Hansen's disease -- Chapter 20: Differential diagnosis of cutaneous lesions of Hansen's disease -- Chapter 21: Differential diagnoses of the neurological manifestations of Hansen's disease -- Chapter 22: Immune and Chemoprophylaxis in Hansen's disease -- Chapter 23: Psychosocial aspects of Hansen's diseases -- Chapter 24: Peripheral Nerve by Ultrasound in Hansen's Disease -- Chapter 25: Electroneuromyography in Hansen's Disease -- Chapter 26: Treatment of Hansen's disease.