Objective To investigate the biological characteristics and epidemiological significance of Yersinia pestis strains in Qinghai Province in order to provide a scientific basis for plague prevention and control.Methods Biochemical typing and glycolysis testing were performed on Y.pestisisolated in Qinghai Province from 2003-2012,and its virulence factors and virulence were determined.Results According to biochemical typing,120 of the 131 strains tested were from the Qinghai-Tibet Plateau,3 were from the Qilia...