1. Division of Infectious Diseases, School of Medicine, Global Health InstituteDuke University 27710 Durham NC USA
2. Global Health Research CenterDuke-Kunshan University 215316 Kunshan China
3. State Key Laboratory of Pathogen and BiosecurityBeijing Institute of Microbiology and Epidemiology 100071 Beijing China
4. Shandong Provincial Center for Disease Control and Prevention 250013 Jinan China
5. Shandong Provincial Key Laboratory of Disease Control and Prevention 250013 Jinan China
6. Wuxi Center for Disease Control and Prevention 214023 Wuxi China
7. Licheng District Center for Disease Control and Prevention 250199 Jinan China
8. Program in Emerging Infectious DiseasesDuke-NUS Medical School 169857 Singapore Singapore