Jiangsu gdk Biotechnology Co., Ltd. engages in the research and development, production and sale of human vaccines. Its products include freeze-dried human rabies, quadrivalent influenza virus, 23-valent pneumococcal polysaccharide, freeze-dried live attenuated varicella, freeze-dried live attenuated herpes zoster, 13-valent pneumococcal polysaccharide conjugate and recombinant shingles vaccines. The company was founded by Yun De Hou and Jing Zhao on December 29, 2008 and is headquartered in Taizhou, China.