VaxGen was a biopharmaceutical company based in the San Francisco Bay Area. On July 28, 2010, VaxGen Inc. was acquired by diaDexus, Inc., in a reverse merger transaction. VaxGen, Inc. does not have significant operations. The company seeks to enter into a strategic transaction or series of strategic transactions. Previously, it was engaged in the development of vaccines that immunize against infectious disease. The company was founded in 1995 and was based in South San Francisco, California.