___

• 1.Shinde V, Bridges CB, Uyeki TM, et al. Triple-reassortant swine influenza A (H1) in humans in the United States, 2005-2009. N Engl J Med 2009;350(25):2616-25.
• 2.Garten RJ, Davis CT, Russell CA, et al. Antigenic and genetic characteristics of swine-origin 2009 A (H1N1): early findings. Science 2009;325(5934):1557-61
• 3.Centers for Disease Control and Prevention (CDC). Serum cross-reactive antibody response to a novel influenza A (H1N1) virus after vaccination with seasonal influenza vaccine. MMWR Morb Mortal Wkly Rep. 2009;58(19):521-4.
• 4.Miller E, Hoschler K, Hardelid P, Stanford E, Andrews N, Zambon M. Incidence of 2009 pandemic influenza A H1N1 infection in England: a cross-sectional serological study. Lancet 2010;375:1100-8.
• 5.Babasaneb T, Shailesh P, Yogesh G, et al. Seroepidemiology of pandemic influenza A (H1N1) 2009 virus infections in Pune, India. BMC Infectious Diseases 20100; 10:255
• 6.Itoh Y, Shinya K, Kiso M, et al. In vitro and in vivo char- acterisation of new swine-origin H1N1 influenza viruses. Nature 2009;460(7258):1021-5.
• 7.Miller E, Hoschler K, Hardelid P, Stanford E, Andrews N, Zambon M. Incidence of 2009 pandemic influenza A H1N1 infection in England: a cross-sectional serological study. Lancet 2010;375:1100-08.
• 8.Tang JW, Tambyah PA, Wilder-Smith A, et al. Cross- reactive antibodies to pandemic (H1N1) 2009 virus, Singapore. Emerg Infect Dis 2010;16(5):874-6.
• 9.Ikonen N, Strengell M, Kinnunen L. et al. High frequency of cross-reacting antibodies against
• 10.2009 pandemic influenza A (H1N1) virus among the elder- ly in Finland. Euro Surveill 2010;15(5):19478
• 11.Ministry of Health, New Zealand: Seroprevalence of the 2009 influenza A (H1N1) pandemic in New Zealand. http://www.nzdoctor.co.nz/media/224143/seropreva- lence-flu-2009.pdf0.
• 12.Jiang T, Li X, Liu W, et al. Serum antibody response to the novel influenza A (H1N1) virus in the elderly. Clin Infect Dis 2010;50:285-6.