Characterization of an H5N1 avian influenza virus from Taiwan

被引:36
作者
Lee, M. S.
Deng, M. C.
Lin, Y. J.
Chang, C. Y.
Shieh, Happy K.
Shiau, J. Z.
Huang, C. C.
机构
[1] Anim Hlth Res Inst, Council Agr, Taipei 251, Taiwan
[2] Natl Chung Hsing Univ, Coll Vet Sci, Dept Vet Med, Taichung 40227, Taiwan
关键词
highly pathogenic avian influenza; H5N1; surveillance; interspecies transmission;
D O I
10.1016/j.vetmic.2007.04.021
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
In 2003, an avian influenza (AI) virus of H5N1 subtype (A/Duck/China/E319-2/03; Dk/CHN/E319-2/03) was isolated from a smuggled duck in Kinmen Island of Taiwan. Phylogenetic analysis and pairwise comparison of nucleotide and amino acid sequences revealed that the virus displayed high similarity to the H5N1 viruses circulating in Asia during 2004 and 2005. The hemagglutinin (HA) protein of the virus contained multiple basic amino acid residues (-RERRRKR-) adjacent to the cleavage site between the HA1 and HA2 domains, showing the highly pathogenic (HP) characteristics. The HP phenotype was confirmed by experimental infection of chickens, which led up to 100% mortality within 24-72 h postinfection. The virus replicated equally well in the majority of organs of the infected chickens with titers ranging from 10(7.5) to 10(4.7) 50% embryo lethal dose (ELD50) per gram of tissue. In a mouse model the virus exhibits low pathogenic characteristics with a lethal infection observed only after applying high inoculating dose (>= 10(7.6) ELD50) of the virus. The infectious virus particles were recovered only from the pulmonary system including trachea and lungs. Our study suggests that ducks infected with H5N1 AIV of HPAI pathotype showing no disease signs can carry the virus silently and that bird smuggling represent a serious risk for H5N1 HPAI transmission. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:193 / 201
页数:9
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