Pandemic (H1N1) 2009 Cases
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[1] Gerardo Chowell,et al. Severe respiratory disease concurrent with the circulation of H1N1 influenza. , 2009, The New England journal of medicine.
[2] Ron A M Fouchier,et al. Antigenic and Genetic Characteristics of Swine-Origin 2009 A(H1N1) Influenza Viruses Circulating in Humans , 2009, Science.