AI Article Synopsis
- H5N8 highly-pathogenic avian influenza viruses (HPAIVs) have spread worldwide through migratory waterfowl, affecting various bird species.
- In experiments with infected Pekin ducks, transmission occurred efficiently among ducks and turkeys, resulting in 100% infection rates, but only 13% infection in chickens.
- The study found no changes in the virus among ducks but did observe genetic changes in terrestrial species, leading to typical HPAIV pathogenesis with higher mortality in chickens and turkeys compared to ducks.
Article 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.
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| http://dx.doi.org/10.1016/j.virol.2019.10.014 | DOI Listing |
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