Beijing Wan Tai Biopharmaceutical Co., Ltd., which is controlled by Yangshengtang Group, is an in-vitro diagnostic reagent and vaccine manufacturer integrating scientific research, development and production, and has become a national bio-high technology industrialization demonstration project base. Production of HBsAg, HCV, HIV, TP, TRUST, HTLV and other complete sets of blood screening reagents, as well as hospital clinical detection of hepatitis, sexually transmitted diseases, tumors, enzyme-linked immunosorbent assay and gold-labeled rapid diagnostic reagents. At the same time, it also provides 55 varieties and more than 200 specifications of biochemical products. It is one of the manufacturers of in vitro immunodiagnostic reagents with complete products in China.