1. Department of Infectious Disease Control, Beijing Institute of Disease Control and Prevention, Beijing, People's Republic of China
2. Experimental Animal Center, Academy of Military Medical Science, Beijing, People's Republic of China
3. Department of Epidemiology and Biostatistics, Key Laboratory of Zoonosis, Ministry of Education, School of Public Health, Jilin University, Changchun, Jilin, People's Republic of China
4. Plague and Brucellosis Prevention and Control Base, Chinese Centers for Disease Control and Prevention, Baicheng, Jilin, People's Republic of China