The Department of Health and Human Services, specifically the Biomedical Advanced Research and Development Authority (BARDA), is seeking information from potential partners regarding the development of vaccines for the Marburg virus (MARV) and Sudan virus (SUDV). This Sources Sought Notice (SSN) aims to gather insights on vaccine candidates, particularly those that are in or beyond Phase 2 clinical trials, to enhance BARDA's understanding of the current marketplace for these critical medical countermeasures. The development of effective vaccines against MARV and SUDV is vital for preparing for potential public health crises stemming from emerging infectious diseases. Interested parties are encouraged to submit concise responses, limited to ten pages, by November 18, 2024, and can direct inquiries to primary contact Yifan Yang at yifan.yang@hhs.gov or secondary contact Greg Smith at greg.smith1@hhs.gov.