The vaccine project is a single study project that uses a single influenza-based model of a medium-sized city in the United States. It was developed by the Emory Group headed by Ira Longini. The study consists of six runs generated from a single epidemiological model of disease spread. The main hypothesis behind the vaccine distribution study is to assess whether targeted antiviral prophylaxis (TAP), taken prophylactically, is effective in containing influenza. The authors conclude that TAP is nearly as effective as vaccinating 80% of the population, and further, that vaccinating 80% of children less than 19 years of age is almost as effective as vaccinating 80% of the entire study population.