1. Swine influenza A (H1N1) infection in two children—Southern California, March–April 2009.;Centers for Disease Control and Prevention;MMWR Morb Mortal Wkly Rep,2009
2. World Health organization. Pandemic (H1N1) 2009 update 58 [cited 2012 Mar 14]. http://www.who.int/csr/don/2009_07_06/en/index.html
3. General Administration of Quality Supervision, Inspection, and Quarantine of the People’s Republic of China. Notice on completion of entry-exit health card at land and water borders, 2009 [cited 2012 May 10]. http://www.aqsiq.gov.cn/zjxw/zjxw/zjftpxw/200905/t20090504_113171.htm
4. General Administration of Quality, Supervision, and Quarantine of the People’s Republic of China. Emergency notice on prevention against the importation of human infection with swine influenza, 2009 [cited 2012 May 10]. http://www.aqsiq.gov.cn/zwgk/tzgg/200904/t20090425_112329.htm
5. World Health Organization. CDC protocol of realtime RT-PCR for influenza A (H1N1) [cited 2012 Mar 14]. http://www.who.int/csr/resources/publications/swineflu/realtimeptpcr/en/