3Horimoto T, Kawaoka Y. Pandemic threat posed by avian influenza aviruses [J]. Clin Microbiol Rev,2001,14(1): 129 -149.
4Fynan EF, Webster RG, Fuller DH, et al. DNA Vaccines: Protective immunizations by parenteral, mucosal, and gene-gun inoculations [J]. Proc Natl Acad Sci U S A, 1993,90(24): 11478 - 11482.
5Suarez DL, Perdue ML, Cox N,et al. Comparisons of highly virulent H5N1 influenza a viruses isolated from humans and chickens from Hong Kong [J] .J Virol,1998,72(8): 6678- 6688.
6Zhou NN, Senne DA, Landgraf JS, et al. Genetic reassortment of avian, swine, and human influenza a viruses in American pigs [J] .J Virol, 1999,73(10): 8851 - 8856.
7Gorman OT, Bean W J, Kawaoka Y, et al. Evolution of the nucleoprotein gene of influenza a virus [J ]. J Virol, 1990,64(4): 487 - 1497.
8Ouchi R,Ohuchi M,Garten W, et al. Human influenza virus hemagglutinin with high sensitivity to proteolytic avtivation[J]. J Virol, 1991,65:3530 - 3537.
9Shu LL, Bean W J. Webster RG. Analysis of the evolution and variation of the human influenza a virus nucleoprotein gene from 1933 to 1990 [J] .J Virol, 1993,67(5):2723- 2729.
10Garmory HS,Brown KA, Titball RW. DNA vaccines:improving expression of antigens [J]. Genet Vaccines Ther,2003,1(1):2.
