Characterization of #avian #influenza #H5N3 #reassortants isolated from #migratory waterfowl and #domestic #ducks in #China from 2015 to 2018 (Transbound Emerg Dis., abstract)

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

Transbound Emerg Dis. 2019 Aug 11. doi: 10.1111/tbed.13324. [Epub ahead of print]

Characterization of avian influenza H5N3 reassortants isolated from migratory waterfowl and domestic ducks in China from 2015 to 2018.

Li X1, Cui P2, Zeng X2, Jiang Y2, Li Y1, Yang J1, Pan Y1, Gao X1, Zhao C1, Wang J1, Wang K1, Deng G2, Guo J1.

Author information: 1 College of Agricultural, Liaocheng University, Liaocheng, People’s Republic of China. 2 State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, People’s Republic of China.



Wild and domestic aquatic birds are the natural reservoirs of avian influenza viruses (AIVs). All subtypes of AIVs, including 16 hemagglutinin (HA) and nine neuraminidase (NA), have been isolated from the waterfowls. The H5 viruses in wild birds display distinct biological differences from their highly pathogenic H5 counterparts. Here, we isolated seven H5N3 AIVs including three from wild birds and four from domestic ducks in China from 2015 to 2017. The isolation sites of all the seven viruses were located in the region of the East Asian-Australasian Migratory Flyway. Phylogenetic analysis indicated that the surface genes of these viruses originated from the wild bird H5 HA subtype and the N3 Eurasian lineage. The internal genes of the seven H5N3 isolates are derived from the five gene donors isolated from the wild birds or ducks in Eastern-Asia region. They were also divided into five genotypes according to their surface genes and internal gene combinations. Interestingly, two of the seven H5N3 viruses contributed their partial internal gene segments (PB1, M and NS) to the newly emerged H7N4 reassortants, which have caused first human H7N4 infection in China in 2018. Moreover, we found that the H5N3 virus used in this study react with the anti-serum of the H5 subtype vaccine isolate (Re-11 and Re-12) and reacted well with the Re-12 anti-serum. Our findings suggest that worldwide intensive surveillance and the H5 vaccination (Re-11 and Re-12) in domestic ducks are needed to monitor the emergence of novel H5N3 reassortants in wild birds and domestic ducks and to prevent H5N3 viruses transmission from the apparently healthy wild birds and domestic ducks to chickens.

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KEYWORDS: H5N3; avian influenza virus; ducks; migratory birds

PMID: 31402584 DOI: 10.1111/tbed.13324

Keywords: Avian Influenza; H5N3; Reassortant strain; Poultry; Wild Birds; China.


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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 ( in the midst of the Ebola epidemic in West Africa in 2014, I left the site to continue alone my data tracking job.