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Transmission dynamics between infected waterfowl and terrestrial poultry: Differences between the transmission and tropism of H5N8 highly pathogenic avian influenza virus (clade 2.3.4.4a) among ducks, chickens and turkeys

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  • Transmission dynamics between infected waterfowl and terrestrial poultry: Differences between the transmission and tropism of H5N8 highly pathogenic avian influenza virus (clade 2.3.4.4a) among ducks, chickens and turkeys


    Virology. 2020 Feb;541:113-123. doi: 10.1016/j.virol.2019.10.014. Epub 2019 Oct 31. Transmission dynamics between infected waterfowl and terrestrial poultry: Differences between the transmission and tropism of H5N8 highly pathogenic avian influenza virus (clade 2.3.4.4a) among ducks, chickens and turkeys.

    Puranik A1, Slomka MJ2, Warren CJ1, Thomas SS1, Mahmood S1, Byrne AMP1, Ramsay AM1, Skinner P1, Watson S3, Everett HE1, Nez A4, Brown IH1, Brookes SM1.
    Author information

    Abstract

    H5N8 highly-pathogenic avian influenza viruses (HPAIVs, clade 2.3.4.4) have spread globally via migratory waterfowl. Pekin ducks infected with a UK virus (H5N8-2014) served as the donors of infection in three separate cohousing experiments to attempt onward transmission chains to sequentially introduced groups of contact ducks, chickens and turkeys. Efficient transmission occurred among ducks and turkeys up to the third contact stage, with all (100%) birds becoming infected. Introduction of an additional fourth contact group of ducks to the turkey transmission chain demonstrated retention of H5N8-2014's waterfowl-competent adaptation. However, onward transmission ceased in chickens at the second contact stage where only 13% became infected. Analysis of viral progeny at this contact stage revealed no emergent polymorphisms in the intra-species (duck) transmission chain, but both terrestrial species included changes in the polymerase and accessory genes. Typical HPAIV pathogenesis and mortality occurred in infected chickens and turkeys, contrasting with 5% mortality among ducks.
    Crown Copyright 2019. Published by Elsevier Inc. All rights reserved.


    KEYWORDS:

    A/goose/Guangdong/1/96 (GsGd) lineage; Chicken; Clade 2.3.4.4; Duck; H5N8 highly pathogenic avian influenza virus (HPAIV); Influenza; Pathogenesis; Polymorphism; Transmission; Turkey

    PMID: 32056709 DOI: 10.1016/j.virol.2019.10.014

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