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Variation in viral shedding patterns between domestic and wild terrestrial birds infected experimentally with reassortant avian influenza virus (H9N2)

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Avian influenza (H9N2) virus infection is an emerging respiratory problem and its prevalence varies significantly among different species of birds. The current knowledge about virus shedding parameters in terrestrial birds is limited. With this in mind, the present study was conducted in different domestic and wild terrestrial birds to investigate species-related differences in infectivity and pattern of viral shedding associated with H9N2 AI virus. Groups of terrestrial birds (domestic Guinea Fowl Numida meleagridis, Japanese Quail Coturnix coturnix japonica, House Sparrows Passer domesticus, House Crows Corvus splendens and Bank Myna Acridotheres ginginianus) were inoculated intra-nasally with A/chicken/Pakistan/10RS3039-284-48/2010 (H9N2) AI virus (106 EID50) and then examined for infectivity and virus shedding patterns. With the exception of House Crows, all infected birds showed clinical signs of different severity, showing the most prominent disease signs in Japanese Quail. All infected birds showed positive results for virus shedding, however, the pattern of virus shedding was different among wild terrestrial birds. Japanese Quail showed the highest levels of virus shedding while samples collected from House Crows revealed only very low levels. Interestingly, virus shedding was observed predominantly via the gastrointestinal tract in House Sparrows and Bank Myna and via the buccal cavity route in Guinea Fowl and Japanese Quail. Here we investigated that the novel genotype of H9N2 AI virus circulating in Pakistan causes clinical disease signs in domestic and wild terrestrial birds. The results of this study suggest that virus shedding varies between different related avian species and highlights the potential role of Guinea Fowl, Japanese Quail, House Sparrows and Bank Myna as mixing bowls for the transmission and maintenance of H9N2 AI viruses between premises.
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Keywords: AVIAN INFLUENZA VIRUS; TERRESTRIAL BIRDS; VIRAL SHEDDING

Document Type: Research Article

Publication date: 01 September 2016

This article was made available online on 06 July 2016 as a Fast Track article with title: "Variation in viral shedding patterns between domestic and wild terrestrial birds infected experimentally with reassortant avian influenza virus (H9N2)".

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  • Avian Biology Research provides a forum for the publication of research in every field of ornithology. It covers all aspects of pure and applied ornithology for wild or captive species as well as research that does not readily fit within the publication objectives of other ornithological journals. By considering a wide range of research fields for publication, Avian Biology Research provides a forum for people working in every field of ornithology. The journal also includes sections on avian news, conference diary and book reviews.

    Editor-in-Chief: Charles Deeming Editors: Tom Pike; Dale Sandercock; Claudia Wascher; Josh Firth; David Wilkinson; Jim Reynolds Production Editor: Claire Pike

    Cover image: Caribbean Flamingos (Phoenicopterus ruber). Credit: Jearu/Shutterstock.com.

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