1. Institute of Infectious Disease Control and Prevention, Guangdong Provincial Center for Disease Control and Prevention , Guangzhou, Guangdong , P.R. China
2. General Office, Zhongshan Center for Disease Control and Prevention , Zhongshan, Guangdong , P.R. China
3. Institute of Pathogenic Microbiology, Guangdong Provincial Center for Disease Control and Prevention , Guangzhou, Guangdong , P.R. China
4. Institute of Infectious Disease Control and Prevention, Zhongshan Center for Disease Control and Prevention , Zhongshan, Guangdong , P.R. China
5. Guangdong Provincial Field Epidemiology Training Program, Guangdong Provincial Center for Disease Control and Prevention , Guangzhou, Guangdong , P.R. China
6. Department of Disinfection and Vector Control, Guangzhou Tianhe District Center for Disease Control and Prevention , Guangzhou, Guangdong , P.R. China
7. Institute of Pathogenic Microbiology, Zhongshan Center for Disease Control and Prevention , Zhongshan, Guangdong , P.R. China
8. Department of Prevention & Healthcare, Zhongshan City People's Hospital , Zhongshan, Guangdong , P.R. China