World Cup: With handy app, Brazilians hope to fight dengue While World Cup referees finally have goal-line technology to prevent mistakes, doctors in Brazil will soon have their own computer gizmo to contain dengue outbreaks. In the tropical northeastern city of Natal, a new smartphone application could allow residents to alert authorities about the location of concentrations of mosquitos and cases of dengue with the touch of a finger. A natural sound version of an AFPTV report.