#Virus-like particles displaying #H5, #H7, #H9 #hemagglutinins and N1 #neuraminidase elicit protective #immunity to heterologous #avian #influenza viruses in #chickens (Virology, abstract)

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

Virology. 2016 Dec 6;501:176-182. doi: 10.1016/j.virol.2016.12.001. [Epub ahead of print]

Virus-like particles displaying H5, H7, H9 hemagglutinins and N1 neuraminidase elicit protective immunity to heterologous avian influenza viruses in chickens.

Pushko P1, Tretyakova I2, Hidajat R2, Zsak A3, Chrzastek K3, Tumpey TM4, Kapczynski DR3.

Author information: 1Medigen, Inc., 8420 Gas House Pike, Suite S, Frederick, MD 21701, USA. Electronic address: ppushko@medigen-usa.com. 2Medigen, Inc., 8420 Gas House Pike, Suite S, Frederick, MD 21701, USA. 3USDA SEPRL, 934 College Station Rd, Athens, GA, USA. 4Influenza Division, CDC,1600 Clifton Road N.E., Atlanta, GA, USA.



Avian influenza (AI) viruses circulating in wild birds pose a serious threat to public health. Human and veterinary vaccines against AI subtypes are needed. Here we prepared triple-subtype VLPs that co-localized H5, H7 and H9 antigens derived from H5N1, H7N3 and H9N2 viruses. VLPs also contained influenza N1 neuraminidase and retroviral gag protein. The H5/H7/H9/N1/gag VLPs were prepared using baculovirus expression. Biochemical, functional and antigenic characteristics were determined including hemagglutination and neuraminidase enzyme activities. VLPs were further evaluated in a chicken AI challenge model for safety, immunogenicity and protective efficacy against heterologous AI viruses including H5N2, H7N3 and H9N2 subtypes. All vaccinated birds survived challenges with H5N2 and H7N3 highly pathogenic AI (HPAI) viruses, while all controls died. Immune response was also detectable after challenge with low pathogenicity AI (LPAI) H9N2 virus suggesting that H5/H7/H9/N1/gag VLPs represent a promising approach for the development of broadly protective AI vaccine.

Copyright © 2016. Published by Elsevier Inc.

KEYWORDS: Avian flu; Influenza; Recombinant; VLP; Vaccine; Virus-like particle

PMID: 27936463 DOI: 10.1016/j.virol.2016.12.001

[PubMed – as supplied by publisher]

Keywords: Avian Influenza; poultry; vaccines; H7N9; H9N2; H5N2; H7N3; 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 (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.