The Department of Health and Human Services, specifically the Centers for Disease Control and Prevention (CDC), is soliciting proposals for a contract focused on the development and execution of serological assays for the detection and characterization of influenza viruses. The primary objectives include performing hemagglutination inhibition assays on human sera for vaccine effectiveness studies and creating a new serology platform that matches the capabilities of existing assays, with an expected testing volume of approximately 6,000 samples annually. This initiative is crucial for enhancing public health responses to influenza through improved detection methodologies and is set within a framework that emphasizes small business participation and adherence to federal acquisition regulations. Interested parties can contact Jennifer Gartzke at jgartzke@cdc.gov or by phone at 404-498-0020 for further details, with the contract performance period commencing on April 28, 2025, and extending through optional periods thereafter.