Cholera is an acute diarrhoeal infection caused by ingestion of contaminated water or food. This introductory-level course has 4 sections and is intended for personnel responding to cholera outbreaks in complex emergencies or in settings where the basic environmental infrastructures have been damaged or destroyed. Section 1: Case definition and alerts for cholera. Section 2: Main transmission routes. Section 3: Key preventive actions. Section 4: Multisectoral cholera control strategy. We hope that this course will help you refresh what you already know and help you transform good principles on cholera management into action. Resources are attached to each section to dive further into this topic.