6Sail Y M,Barnes H J,Glisson J R, et al. Diseases of Poultry [M]. 11st ed. Ames: Iowa State University Press, 2003 : 676-682.
7Huang B, Kwang J, Loh H, et al. Development of an ELISA using a recombinant 41 ku partial protein (P45N) for the detection of Riemerella anatipestifer infections in ducks [J]. Vet Microbiol, 2002,88 (4) : 339-349.
8Mark A V,Joyce J R. The power of real-time PCR [J]. Adv Physiol Educ, 2005,29 : 151-159.
9Lan M. Real-time PCR in virology[J]. Nucleic Acids Res,2002,30(6) :1290-1305.
