The Influenza Hospitalization Surveillance Network (FluSurv-NET) is a population-based surveillance system that collects data on laboratory-confirmed influenza-associated hospitalizations among children and adults through a network of acute care hospitals in 14 states. CDC seeks to expand the utilization of electronic health information in FluSurv-NET and improve data exchange between healthcare facilities, state/local public health partners, and CDC to maintain the quality of these important surveillance activities while improving the efficiency and timeliness with which these data are available. Such enhancements will reduce burden on surveillance sites and allow for scalability to additional sites in the future. The project will leverage the MedMorph Reference Architecture along with other relevant existing health data and exchange standards to develop and pilot FHIR-based content implementation guides that facilitate patient-level data exchange on persons hospitalized with influenza to public health surveillance partners in FluSurv-NET. The ultimate goal is to improve the availability of EHR data for public health surveillance of hospitalized persons with influenza and other respiratory viruses and reduce the burden of data collection on surveillance officers and healthcare facilities and complement ongoing CDC data modernization initiatives.