Emergence of multiple clade 2.3.2.1 influenza A (H5N1) virus subgroups in Vietnam and detection of novel reassortants

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• 作者：Adrian Creanga ; Diep Thi Nguyen ; Nancy Gerloff ; Hoa Thi Do ; Am ; a Balish ; Hoang Dang Nguyen ; Yunho Jang ; Vui Thi Dam ; Sharmi Thor ; Joyce Jones ; Natosha Simpson ; Bo Shu ; Shannon Emery ; LaShondra Berman ; Ha T. Nguyen ; Juliet E. Bryant ; Steve Lindstrom ; Alex ; er Klimov ; Ruben O. Donis ; C.Todd Davis ; et al.
• 关键词：Orthomyxovirus ; Highly pathogenic avian influenza virus ; Phylogenetics ; Geographic distribution ; H5N1 ; Evolution ; Reassortment
• 刊名：Virology
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：444
• 期：1-2
• 页码：12-20
• 全文大小：1339 K

文摘

Phylogenetic analyses of 169 influenza A(H5N1) virus genomes were conducted for samples collected through active surveillance and outbreak responses in Vietnam between September 2010 and September 2012. While clade 1.1 viruses persisted in southern regions, three genetically distinct subgroups of clade 2.3.2.1 were found in northern and central Vietnam. The identification of each subgroup corresponded with detection of novel reassortants, likely due to their overlapping circulation throughout the country. While the previously identified clade 1.1 and A/Hubei/1/2010-like 2.3.2.1 genotypes remained the predominant viruses detected, four viruses were found to be reassortants between A/Hubei/1/2010-like (HA, NA, PB2, PB1, PA, NP) and A/duck/Vietnam/NCVD-885/2010-like (M, NS) viruses and one virus was identified as having A/duck/Vietnam/NCVD-885/2010-like HA, NA, PB1, and NP with A/Hubei/1/2010-like PB2 and PA genes. Additionally, clade 2.3.2.1 A/Hong Kong/6841/2010-like viruses, first detected in mid-2012, were identified as reassortants comprised of A/Hubei/1/2010-like PB2 and PA and A/duck/Vietnam/NCVD-885/2010-like PB1, NP, NA, M, NS genes.