Avian Influenza (H5N1) Virus of Clade 2.3.2 in Domestic Poultry in India

被引：55

作者：

Nagarajan, Shanmuga ^{[1
]}

Tosh, Chakradhar ^{[1
]}

Smith, David K. ^{[3
]}

Peiris, Joseph Sriyal Malik ^{[2
]}

Murugkar, Harshad Vinayakrao ^{[1
]}

Sridevi, Rajangam ^{[1
]}

Kumar, Manoj ^{[1
]}

Katare, Megha ^{[1
]}

Jain, Rajlaxmi ^{[1
]}

Syed, Zohra ^{[1
]}

Behera, Padmanava ^{[1
]}

Cheung, Chung L. ^{[2
]}

Khandia, Rekha ^{[1
]}

Tripathi, Sushil ^{[1
]}

Guan, Yi ^{[2
]}

Dubey, Shiv Chandra ^{[1
]}

机构：

[1] Indian Vet Res Inst, High Secur Anim Dis Lab, Bhopal, India

[2] Univ Hong Kong, State Key Lab Emerging Infect Dis, Hong Kong, Hong Kong, Peoples R China

[3] Shantou Univ, Sch Med, Univ Hong Kong,Int Inst Infect & Immun, State Key Lab Emerging Infect Dis,Li Ka Shing Fac, Shantou, Peoples R China

来源：

PLOS ONE | 2012年 / 7卷 / 02期

基金：

美国国家卫生研究院;

关键词：

WILD BIRDS; HEMAGGLUTININ; VIRULENCE; OUTBREAK;

D O I：

10.1371/journal.pone.0031844

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

South Asia has experienced regular outbreaks of H5N1 avian influenza virus since its first detection in India and Pakistan in February, 2006. Till 2009, the outbreaks in this region were due to clade 2.2 H5N1 virus. In 2010, Nepal reported the first outbreak of clade 2.3.2 virus in South Asia. In February 2011, two outbreaks of H5N1 virus were reported in the State of Tripura in India. The antigenic and genetic analyses of seven H5N1 viruses isolated during these outbreaks were carried out. Antigenic analysis confirmed 64 to 256-fold reduction in cross reactivity compared with clade 2.2 viruses. The intravenous pathogenicity index of the isolates ranged from 2.80-2.95 indicating high pathogenicity to chickens. Sequencing of all the eight gene-segments of seven H5N1 viruses isolated in these outbreaks was carried out. The predicted amino acid sequence analysis revealed high pathogenicity to chickens and susceptibility to the antivirals, amantadine and oseltamivir. Phylogenetic analyses indicated that these viruses belong to clade 2.3.2.1 and were distinct to the clade 2.3.2.1 viruses isolated in Nepal. Identification of new clade 2.3.2 H5N1 viruses in South Asia is reminiscent of the introduction of clade 2.2 viruses in this region in 2006/7. It is now important to monitor whether the clade 2.3.2.1 is replacing clade 2.2 in this region or co-circulating with it. Continued co-circulation of various subclades of the H5N1 virus which are more adapted to land based poultry in a highly populated region such as South Asia increases the risk of evolution of pandemic H5N1 strains.

引用

页数：8

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