Abstract
In response to the 2009 H1N1 pandemic, the Early Warning Infectious Disease Surveillance Program (EWIDS) from the Office of Binational Border Health California Department of Public Health, sought to strengthen outpatient ILI surveillance along the California/Baja California border region by creating a binational outpatient provider influenza surveillance network. Since the 2009-2010 influenza season the network monitors both syndromic and virologic influenza activity. The network serves as an example of a successful binational coordinated effort to establish an early warning system for enhancing situational awareness of influenza activity in a cross-border setting.