Dengue is a year-round risk in many parts of the world, with outbreaks commonly occurring every 2-5 years. Travelers to risk areas should prevent mosquito bites. Country List : Argentina, Brazil, Burkina Faso, Cambodia, Colombia, Costa Rica, Curaçao, Ecuador, including the Galápagos Islands, Ethiopia, Fiji, French Guiana (France), Guadeloupe, Guatemala, Guyana, Honduras, Indonesia, Laos, Mali, Martinique (France), Mauritius, Mexico, Nicaragua, Panama, Paraguay, Peru, Samoa, Singapore, Sri Lanka, Sudan, Uruguay, Afghanistan