The Department of Health and Human Services, specifically the National Institutes of Health (NIH) through its National Institute of Allergy and Infectious Diseases (NIAID), intends to negotiate a sole-source contract with BuildClinical, LLC for an online recruitment campaign related to a Phase 1 clinical study of a novel influenza vaccine. The primary objective of this procurement is to effectively recruit healthy adult participants for a clinical trial evaluating the safety, tolerability, and immunogenicity of the mosaic hexavalent influenza vaccine VRC-FLUMOS0116-00-VP, with and without an adjuvant, to address the significant public health challenge posed by seasonal and pandemic influenza. This initiative is crucial as influenza continues to result in substantial morbidity and mortality, and the development of a universal vaccine is a priority for public health. Interested parties may submit capability statements via the NIH electronic Simplified Acquisition Submission System (eSASS) by January 3, 2025, at 5:00 PM ET, with all submissions requiring registration in the eSASS system. For further inquiries, Dana Monroe can be contacted at dana.monroe@nih.gov or by phone at 406-375-9814.