1. Shenzhen Major Infectious Disease Control Key Laboratory, Shenzhen Center for Disease Control and Prevention, Guangdong Province, People's Republic of China.
2. International Emerging Infections Program, United States Centers for Disease Control and Prevention, Beijing, People's Republic of China.
3. Global Disease Detection Branch, Division of Global Health Protection, Center for Global Health, United States Centers for Disease Control and Prevention, Atlanta, Georgia.
4. Xixiang People's Hospital, Baoan District, Shenzhen, Guangdong Province, People's Republic of China.
5. Key Laboratory of Surveillance and Early-Warning on Infectious Disease, Division of Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, People's Republic of China.