The #complexity of #human infected AIV #H5N6 isolated from #China (BMC Infect Dis., abstract)

[Source: US National Library of Medicine, full page: (LINK). Abstract, edited.]

BMC Infect Dis. 2016 Oct 25;16(1):600.

The complexity of human infected AIV H5N6 isolated from China.

Zhang Z1,2, Li R1,2, Jiang L2,3, Xiong C4,5,6, Chen Y7, Zhao G1,2, Jiang Q2.

Author information: 1Department of Epidemiology and Biostatistics, School of Public Health, Fudan University, Shanghai, People’s Republic of China. 2Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, People’s Republic of China. 3Department of Public Health Microbiology, School of Public Health, Fudan University, Shanghai, People’s Republic of China. 4Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, People’s Republic of China. xiongchenglong@fudan.edu.cn. 5Department of Public Health Microbiology, School of Public Health, Fudan University, Shanghai, People’s Republic of China. xiongchenglong@fudan.edu.cn. 6, Bldg. 8#, Rd. Dong’an 130, Shanghai, 200032, People’s Republic of China. xiongchenglong@fudan.edu.cn. 7School of Epidemiology, Public Health and Preventive Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada.

 

Abstract

BACKGROUND:

Novel avian influenza viruses (AIVs) of H7N9, H10N8, and H5N6 are currently circulating in China’s poultry flocks, occasionally infecting human and other mammals. Human infected AIV H5N6 in China during 2014-2015 is believed to be a triple reassortant originated from H6N6 and two clades of H5 viruses. The current report suggests that its reassortment history is more complicated.

METHODS:

Genomes of human infected isolates of AIV H5N6 were searched from the NCBI Influenza Virus Sequence Database and the Global Initiative on Sharing Avian Influenza Data. Sequences shared high identities with each segment of their genomes were obtained through the Basic Local Alignment Search Tool. Alignments were done by mafft-7.037-win32 program; 8 large-scale and then 8 gradually converged phylogenetic trees were constructed by using MEGA5.1/5.2/6.0 Software.

RESULTS:

The events that each segment of the genomes of human infected AIV H5N6 isolates circulated in China had evolved into its current status might have happened before 2013, and so were they then reassorted into the epidemic AIV H5N6. A/Guangzhou/39715/2014(H5N6) and A/Sichuan/26221/2014(H5N6) had their six internal segments (PB2, PB1, PA, NP, NEP, and M) in common, and were reassorted from AIVs H5N1 in the same period and same region as that of HA, while A/Yunnan/0127/2015(H5N6) derived its six internal segments from AIV H9N2 that has been prevalent in Eastern China since 2008.

CONCLUSIONS:

AIV H5N6 isolates established from both human and poultry in China during 2014-2015 were heterogeneous; both AIVs H5N1 and H9N2 were involved in the reassortment of AIV H5N6 in China.

KEYWORDS: H5N1; H5N6; H9N2; Reassortment

PMID: 27782815 DOI: 10.1186/s12879-016-1932-1

[PubMed – in process]

Keywords: H5N1; H5N6; H9N2; Avian Influenza; China; Poultry; Human.

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Giuseppe Michieli

I am an Italian blogger, active since 2005 with main focus on emerging infectious diseases such as avian influenza, SARS, antibiotics resistance, and many other global Health issues. Other fields of interest are: climate change, global warming, geological and biological sciences. My activity consists mainly in collection and analysis of news, public services updates, confronting sources and making decision about what are the 'signals' of an impending crisis (an outbreak, for example). When a signal is detected, I follow traces during the entire course of an event. I started in 2005 my blog ''A TIME'S MEMORY'', now with more than 40,000 posts and 3 millions of web interactions. Subsequently I added an Italian Language blog, then discontinued because of very low traffic and interest. I contributed for seven years to a public forum (FluTrackers.com) in the midst of the Ebola epidemic in West Africa in 2014, I left the site to continue alone my data tracking job.