7Dawood FS, Jain S, Finelli L, et al. Emergence of a novel swineorigin influenza A (H1N1) virus in humans[J]. N Engl J Med, 2009, 360(25):2 605-2 615.
8Garten RJ, Davis CT, Russell CA, et al. Antigenic and genetic characteristics of swine-origin 2009 A(H1N1) influenza viruses circulating in humans[J]. science, 2009, 325(5 937) : 197-201.
9Smith GJ,Vijaykrishna D, Bahl J, et al. Origins and evolutionary genomics of the 2009 swine-origin H1N1 influenza A epidemic [J]. nature, 2009, 459(7 250): 1 122-1 125.
