1. National Immunization Program, Chinese Center for Disease Control and Prevention, Beijing, China
2. Sichuan Provincial Center for Disease Control and Prevention, Chengdu, China
3. Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
4. Liangshan Prefectural Center for Disease Control and Prevention, Liangshan, China
5. Leibo County Center for Disease Control and Prevention, Liangshan, China
6. Chinese Field Epidemiology Training Program, Beijing, China
7. Chinese Center for Disease Control and Prevention, Beijing, China
8. for the China cVDPV2 Response Experts Group