›› 2013, Vol. 40 ›› Issue (9): 27-32.

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Analysis of the Virulent Genes of One Newcastle Disease Viruses Isolated from Duck and its Pathogenicity Experiment in Duck

LI Xian-wei, SUN Min-hua, HE Jing, WANG Zhao-xiong, LIU Da-wei, YANG Feng, REN Tao   

  1. MOA Key Laboratory for Animal Vaccine Development, Key Laboratory of Zoonoses Control and Prevention of Guangdong, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
  • Received:2013-03-01 Online:2013-09-20 Published:2013-09-18

Abstract: To explore the epidemiological understanding of Newcastle disease virus (NDV) in ducks, a Newcastle disease virus (NDV-104) was isolated from duck in Guangdong province in 2009. The biologically characteristic, pathogenicity and F and HN gene were explored. The results showed that MDT, ICPI and IVPI of the isolated strain were 56.4 h, 1.95 and 1.64, respectively. Combined with the analysis of the amino acid sequence of the F protein cleavage site (112 to 117), indicating it belonged to velogenic NDVs. The pathogenicity results showed that the isolated strain was infectious and pathogenic in ducks. Genetic analysis revealed that the isolate strain belonged to the gene Ⅶd subtype. The homology analysis of F and HN protein's amino acid showed that the isolated strain shared 96.6% to 99.3% and 97.0% to 99.7%, respectively, with genotype Ⅶ NDVs since 2000. However, the F and HN protein's amino acid of the isolate strains were low similarity with the common vaccine strains, such as B1, V4, Clone30, Mukteswar and LaSota, and were 88.1% and 87.6% similarity with LaSota and V4, which were different from the classical strains of NDV.

Key words: duck; Newcastle disease virus; F gene; HN gene; pathogenicity

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