1. Institute of Medical Biology, Chinese Academy of Medicine Science and Peking Union Medical College, Yunnan Key Laboratory of Vaccine Research and Development on Severe Infectious Diseases, Kunming, China
2. Hubei Province Center for Disease Control and Prevention, Wuhan, China
3. National Institutes for Food and Drug Control, Beijing, China
4. Dangyang City Center for Disease Control and Prevention, Hubei, China
5. Gucheng County Center for Disease Control and Prevention, Hubei, China