[1
]
Division of Infectious Disease, Key Laboratory of Surveillance and Early-warning on
Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing 102206,
China.
[2
]
Zhejiang Provincial Center for Disease Control and Prevention;
[3
]
Wuxi City Center for Disease Control and Prevention.
[4
]
Jiangsu Provincial Center for Disease Control and Prevention.
[5
]
Division of Infectious Disease, Key Laboratory of Surveillance and Early-warning on
Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing 102206,
China. Email: yuhj@chinacdc.cn.