In October 2002, the Chinese delegation to the International Biological Weapons Convention made assurances that the People’s Republic of China (PRC) was not carrying out military-purpose biological research, was not manufacturing bioweapons, and was not stockpiling dual-purpose biological materiel. Yet the People's Liberation Army’s command structure in Wuhan suggests the opposite. That city is home to China’s largest network of civil-military hybrid organizations specialized in biology; thanks to the SARS and H5N1 avian flu epidemics, Wuhan has become a military scientific hub in the fields of virology, epidemiology, bacteriology and other biological research.