The Department of Agriculture, specifically the Animal and Plant Health Inspection Service (APHIS), is seeking to procure the Bacille Calmette-Guerin (BCG) vaccine from Colorado Serum Company, the sole manufacturer capable of supplying this specific strain. This procurement is part of an ongoing study initiated in 2021, aimed at evaluating the effectiveness of BCG vaccination in cattle for combating bovine tuberculosis (bTB) in endemic areas, particularly in Baja California, Mexico. The necessity for a sole source purchase is justified by the unique requirements of the study, including the need for the specific Danish 1331 strain to ensure data consistency and validity. The estimated cost for the vaccine manufacture and shipping is $38,750, and interested parties can contact Jason L. Wilking at Jason.L.Wilking@usda.gov or by phone at 612-336-3210 for further details.