Preliminary results of this analysis suggest that certain temporal patterns of influenza seasons vary by influenza subtype. Future analyses will focus on determining the temporal characteristics for influenza seasons between 1989 and 1996 (and for seasons between 1996 and 2007, using complete NVSS mortality sets) and assessing the intercounty spread of epidemic influenza. Accurately identifying spatiotemporal patterns could improve epidemic prediction and prevention as well as aid the creation of efficient containment policies for pandemic influenza (2) . This analysis will aid public health in developing more effective and efficient strategies to decrease morbidity and mortality associated with seasonal influenza in the United States.