Syndromic surveillance is a new type of surveillance that emerged in the early 1990s, with the initial goal of detecting bioterrorist threats. Since then, syndromic surveillance systems have evolved, and their objectives have been expanded to include the identification of unexpected events, the monitoring of trends (seasonal epidemics), and the assessment of the impact of environmental or infectious phenomena. Their main characteristics are their responsiveness (automated transmission of operational data in real time or near real time) and their flexibility (ability to adapt to surveillance needs), as well as their complementarity with traditional surveillance systems. In France, the SurSaUD® syndromic surveillance system has been in operation since 2004, drawing on four data sources: hospital emergency departments, SOS Médecins associations, INSEE mortality data, and data from electronic death certificates. Complementing traditional surveillance systems, SurSaUD® is one of the tools that enables the French Institute for Public Health Surveillance (InVS) to carry out its daily public health monitoring, surveillance, and alert missions at both the national and regional levels. SurSaUD® is one of the most advanced syndromic surveillance systems in Europe, which led the InVS to coordinate the European "Triple S" project (Syndromic Surveillance Systems in Europe) between 2010 and 2013. The development of collaborations with partners to strengthen the human network, the expansion of analytical methods, and the exploration of integrating new data sources into the system are among the main areas of development for the system. (R.A.)