WANG ZX, LI XW, SUN MH, GAO SM, LIU DW, HE J, REN T. Genotypic and Pathogenic Characterization of Newcastle Disease Viruses Isolated from Domestic Ducks in China. Kafkas Univ Vet Fak Derg, 20 (6): 885-892, 2014. DOI: 10.9775/kvfd.2014.11282