2Blacksell S D, Khounsy S, Boyle D B,et al. Phylogenetic analysis of the E2 gene of classical swine fever viruses from Lao PDR[ J ]. Virus Res ,2004,104( 1 ) :87 - 92.
3Van Gennip H G, Vlot A C, Hulst M M, et al. Determinants of virulence of classical swine fever virus strain Brescia [ J ]. J Virol, 2004,78(16) :8812 -8823.
4Mayer D, Hofmann M A, Tratschin J D. Attenuation of classical swine fever virus by deletion of the viral N (pro) gene[ J ]. Vaccine,2004,22(3 -4) :317 -328.
5Reimann I, Depner K, Trapp S. An avirulent chimeric Pestivirus with altered cell tropism protects pigs against lethal infection with classical swine fever virus[J]. Virology,2004,322 (1) :143 - 157.
6Floegel Niesmann G. Marker vaccines and companion diagnostic tests for classical swine fever[J]. Dev Biol (Basel). 2003,114:185 -191.
