3Alexander D J. A review of avian influenza in different bird species[J]. Vet Microbiol, 2000,74(1,2) : 3-13.
4Lomniczi B, Whemann E, Herczeg J, et al. Newcastle disease outbreaks in recent years in western Europe were caused by an old(V1)and a novel genotype(Ⅶ) [J]. Virology, 1998,43:49- 64.
8Johnson R W. Inhibition of growth by proinflammatory cytokines: An integrated view [J]. J Anim Sci, 1997, 75: 1244- 1255.
9Xie H, Rath N C, Huff G R, et al.Effects of SalmoneUa typhimurium lipopolysaccharide on broiler chickens [J]. Pouh Sci, 2000,79(1): 33-40.
10McHugh K J,Collins S M,Weingarten H P.Central interleukin-1 receptors contribute to suppression of reding after acute colitis in the rat [J]. Am J Physiol, 1994, 266:1659-1663.