The Department of Health and Human Services, specifically the Centers for Disease Control and Prevention (CDC), is soliciting proposals for a contract focused on serological assays for the detection and characterization of influenza viruses. The primary objectives include performing hemagglutination inhibition assays on human serum samples and developing new serology platforms that are comparable to existing methods. This initiative is crucial for enhancing influenza surveillance and vaccine effectiveness studies, addressing ongoing public health challenges. Interested parties must submit a Letter of Interest by 2:00 PM EST on February 7, 2025, and can contact Jennifer Gartzke at jgartzke@cdc.gov or 404-498-0020 for further information.