1. Emergence of a novel swine-origin influenza A (H1N1) virus in humans;FS Dawood,2009
2. New influenza A(H1N1) virus infections: global surveillance summary, May 2009,2009
3. Surveillance trends of the 2009 influenza A(H1N1) pandemic in Europe;A Amato-Gauci,2011
4. Centers for Disease Control and Prevention. FluView 2009–2010 influenza season summary. http://www.cdc.gov/flu/weekly/weeklyarchives2009-2010/09-10summary.htm. Accessed 1 December 2013.
5. versus 2010 comparison of influenza activity in southern hemisphere temperate countries;MD Van Kerkhove,2009