Novel #H7N2 and #H5N6 #Avian #Influenza A Viruses in Sentinel #Chickens: A Sentinel Chicken Surveillance Study (Front Microbiol., abstract)

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

Front Microbiol. 2016 Nov 16;7:1766. eCollection 2016.

Novel H7N2 and H5N6 Avian Influenza A Viruses in Sentinel Chickens: A Sentinel Chicken Surveillance Study.

Zhao T1, Qian YH2, Chen SH2, Wang GL1, Wu MN1, Huang Y1, Ma GY2, Fang LQ1, Gray GC3, Lu B2, Tong YG1, Ma MJ1, Cao WC1.

Author information: 1State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology Beijing, China. 2Wuxi Center for Disease Control and Prevention Wuxi, China. 3Division of Infectious Diseases, Global Health Institute, Nicholas School of the Environment, Duke University, Duke University Medical Center Durham, NC, USA.



In 2014, a sentinel chicken surveillance for avian influenza viruses was conducted in aquatic bird habitat near Wuxi City, Jiangsu Province, China. Two H7N2, one H5N6, and two H9N2 viruses were isolated. Sequence analysis revealed that the H7N2 virus is a novel reassortant of H7N9 and H9N2 viruses and H5N6 virus is a reassortant of H5N1 clade 2.3.4 and H6N6 viruses. Substitutions V186 and L226 (H3 numbering) in the hemagglutinin (HA) gene protein was found in two H7N2 viruses but not in the H5N6 virus. Two A138 and A160 mutations were identified in the HA gene protein of all three viruses but a P128 mutation was only observed in the H5N6 virus. A deletion of 3 and 11 amino acids in the neuraminidase stalk region was found in two H7N2 and H5N6 viruses, respectively. Moreover, a mutation of N31 in M2 protein was observed in both two H7N2 viruses. High similarity of these isolated viruses to viruses previously identified among poultry and humans, suggests that peridomestic aquatic birds may play a role in sustaining novel virus transmission. Therefore, continued surveillance is needed to monitor these avian influenza viruses in wild bird and domestic poultry that may pose a threat to poultry and human health.

KEYWORDS: H5N6 virus; H7N2 virus; H9N2 virus; avian influenza A virus; sentinel chicken; transmission

PMID: 27899915 DOI: 10.3389/fmicb.2016.01766

[PubMed – in process]

Keywords: Reassortant Strains; Avian Influenza; China; Poultry; H7N2; H9N2; H5N6; H6N6; H5N1.


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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.