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Published in: Archives of Virology 1/2019

01-01-2019 | Original Article

Development and comparison of two H5N8 influenza A vaccine candidate strains

Authors: Mi-Seon Lee, Eun Young Jang, Junhyung Cho, Kisoon Kim, Chan Hee Lee, Hwajung Yi

Published in: Archives of Virology | Issue 1/2019

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Abstract

Avian influenza viruses circulating in birds have caused outbreaks of infection in poultry and humans, thereby threatening public health. Recently, a highly pathogenic avian influenza (HPAI) virus (H5N8) of clade 2.3.4.4 emerged in Korea and other countries and caused multiple outbreaks in domestic and wild birds, with concerns for human infection. To combat HPAI viral infections, novel vaccines are likely to be the most effective approach. Therefore, in this study, we generated H5N8 vaccine candidate viruses based on a Korean isolate (A/broiler duck/Korea/Buan2/2014). The vaccine candidate viruses were 2:6 reassortants expressing the two surface glycoproteins of A/broiler duck/Korea/Buan2/2014 on an A/Puerto Rico/8/34 (PR8) backbone generated by using an eight-plasmid-based reverse genetics system with or without replacement of the multi-basic amino acid cleavage motif (MBCM, a crucial pathogenic factor in HPAI virus) with a bi-basic amino acid cleavage motif (BBCM) in their HA. An H5N8 vaccine candidate virus containing the BBCM showed attenuated pathogenesis in embryonated eggs and exhibited less virulence in the infected mice compared with the wild H5N8 virus containing an MBCM. Vaccination with an inactivated preparation of the vaccine candidate virus protected mice from lethal H5N8 viral challenge. This is the first report of the development and evaluation of H5N8 vaccine strains (with an MBCM or BBCM) of HA clade 2.3.4.4 as vaccine candidates. Our findings suggest that H5N8 strains with a BBCM instead of an MBCM might be considered for H5N8 vaccine seed virus development or as a reference vaccine against H5N8 viral strains.
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Metadata
Title
Development and comparison of two H5N8 influenza A vaccine candidate strains
Authors
Mi-Seon Lee
Eun Young Jang
Junhyung Cho
Kisoon Kim
Chan Hee Lee
Hwajung Yi
Publication date
01-01-2019
Publisher
Springer Vienna
Published in
Archives of Virology / Issue 1/2019
Print ISSN: 0304-8608
Electronic ISSN: 1432-8798
DOI
https://doi.org/10.1007/s00705-018-4062-9

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