NHC Key Laboratory of Biosafety;
National Institute for Viral Disease Control and Prevention;
Chinese Center for Disease Control and Prevention;
Beijing 102206;
China;
Center for Disease Control and Prevention of Qinghai Province;
Xining 810007;
Qinghai;
China;
Acute; febrile; respiratory; syndrome; Viral; and; bacterial; etiology; Prevalence; Seasonal; distribution;