The West Nile virus first appeared in North America in 1999 and quickly spread across the continent. In 2002, the first cases of infection in birds and humans were reported in Quebec, and a government response plan was implemented in 2003. The plan aims to prevent infections in the population and monitor the evolution of the epidemiological situation in the field. Various indicators of infection are used: the number of human cases, the number of corvids found dead by the public, and the number of infected mosquitoes. In 2003, the Institut national de santé publique du Québec (INSPQ) was commissioned to develop an information system designed to present statistics and data from the government response plan in near real time. The information system developed includes a geographic location tool, an extranet site used for data entry and electronic data transfer, as well as statistical data presentation. An evaluation of this information system at the end of its first year of operation revealed that users highly appreciated the system. Near-real-time data updates and ease of use are the main advantages of such a system. The operating principle of this system can be easily adapted to other infectious and zoonotic health issues, as well as to several emerging health issues. (R.A.)