1. World Health Organization. Pandemic (H1N1) 2009—update 89. Available at: http://www.who.int/csr/don/2010_02_26/en/index.html [accessed 1 March 2010].
2. World Health Organization. Recommended viruses for influenza vaccines for use in the 2010-2011 northern hemisphere influenza season. Wkly Epidemiol Rec 2010; 85(10):81-92.
3. World Health Organization. Pandemic influenza A (H1N1) 2009 virus vaccine—conclusions and recommendations from the October 2009 meeting of the immunization Strategic Advisory Group of Experts. Wkly Epidemiol Rec 2009; 84(49):505-8.
4. World Health Organization. Director-General statement following the seventh meeting of the Emergency Committee; 24 February 2010. Available at: http://www.who.int/csr/disease/swineflu/7th_meeting_ihr/en/ [accessed 1 March 2010].
5. European Centre for Disease Prevention and Control. Risk assessment. Pandemic H1N1 2009 Version 7; 17 December 2009. Available at: http://www.ecdc.europa.eu/en/healthtopics/Documents/0908_Influenza_AH1N1_Risk_Assessment.pdf. [accessed 17 December 2009].