HealthMap is a multilingual, real-time disease outbreak tracking and visualization system. Launched in fall 2006, the Web site collects over 300 reports per day in seven languages, from both general news media and public health sources around the world. Updated hourly, the system filters these reports to determine relevance, disease, location, and duplication clustering by means of a series of custom-designed, automated, text-processing algorithms. Relevant reports are then aggregated and displayed on a freely available dashboard where users can tailor the view according to date, disease, location, and source. HealthMap provides an overview of real-time information on emerging infectious diseases, and has particular interest for public health officials and international travelers.