"FluAid is a test version of software created by programmers at the Centers for Disease Control and Prevention (CDC). It is designed to assist state and local level planners in preparing for the next influenza pandemic by providing estimates of potential impact specific to their locality. FluAid provides only a range of estimates of impact in terms of deaths, hospitalizations, and outpatients visits due to pandemic influenza. The software cannot describe when or how people will become ill, nor how a pandemic may spread through a society over time."
Centers for Disease Control: http://www.cdc.gov/