The Department of Health and Human Services, specifically the National Institutes of Health (NIH), is seeking qualified vendors to supply Anti-human IgG Fc Capture Biosensors for research at the Vaccine Research Center (VRC). This Sources Sought Notice, identified as SS-NIAID-25-2255392, aims to assess the capabilities of potential suppliers for biosensors that are compatible with the Octet HTX system, which are crucial for measuring protein interactions in vaccine development efforts against pathogens such as HIV-1 and SARS-CoV-2. Vendors are invited to submit a capability statement by March 12, 2025, detailing their qualifications, while adhering to Small Business Administration size standards and indicating interest in socio-economic business categories. Interested parties should direct their responses through the NIAID's electronic Simplified Acquisition Submission System (eSASS), noting that this notice does not obligate the government to award contracts and that all submissions will be reviewed at the government's discretion. For further inquiries, vendors may contact Leah Hinson at leah.hinson@nih.gov.