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Vet Microbiol. 2016 Jan 15;182:35-43. doi: 10.1016/j.vetmic.2015.10.023. Epub 2015 Oct 29.
Sentinel model for influenza A virus monitoring in free-grazing ducks in Thailand.
Boonyapisitsopa S1, Chaiyawong S2, Nonthabenjawan N2, Jairak W2, Prakairungnamthip D3, Bunpapong N1, Amonsin A4.
Author information
Abstract
Influenza A virus (IAV) can cause influenza in birds and mammals. In Thailand, free-grazing ducks are known IAV reservoirs and can spread viruses through frequent movements in habitats they share with wild birds. In this study, the sentinel model for IAV monitoring was conducted over 4 months in two free-grazing duck flocks. IAV subtypes H4N6 (n=1) and H3N8 (n=5) were isolated from sentinel ducks at the ages of 13 and 15 weeks. Clinical signs of depression and ocular discharge were observed in the infected ducks. Phylogenetic analysis and genetic characterization of the isolated IAVs indicated that all Thai IAVs were clustered in the Eurasian lineage and pose low pathogenic avian influenza characteristics. Serological analysis found that antibodies against IAVs could be detected in the ducks since 9-weeks-old. In summary, our results indicate that the sentinel model can be used for IAV monitoring in free-grazing duck flocks. Since free-grazing ducks are potential reservoirs and transmitters of IAVs, routine IAV surveillance in free-grazing duck flocks can be beneficial for influenza prevention and control strategies.
Copyright ? 2015 Elsevier B.V. All rights reserved.
KEYWORDS:
Free-grazing duck; Influenza A; Sentinel; Thailand
PMID: 26711026 [PubMed - in process]
Sentinel model for influenza A virus monitoring in free-grazing ducks in Thailand.
Boonyapisitsopa S1, Chaiyawong S2, Nonthabenjawan N2, Jairak W2, Prakairungnamthip D3, Bunpapong N1, Amonsin A4.
Author information
Abstract
Influenza A virus (IAV) can cause influenza in birds and mammals. In Thailand, free-grazing ducks are known IAV reservoirs and can spread viruses through frequent movements in habitats they share with wild birds. In this study, the sentinel model for IAV monitoring was conducted over 4 months in two free-grazing duck flocks. IAV subtypes H4N6 (n=1) and H3N8 (n=5) were isolated from sentinel ducks at the ages of 13 and 15 weeks. Clinical signs of depression and ocular discharge were observed in the infected ducks. Phylogenetic analysis and genetic characterization of the isolated IAVs indicated that all Thai IAVs were clustered in the Eurasian lineage and pose low pathogenic avian influenza characteristics. Serological analysis found that antibodies against IAVs could be detected in the ducks since 9-weeks-old. In summary, our results indicate that the sentinel model can be used for IAV monitoring in free-grazing duck flocks. Since free-grazing ducks are potential reservoirs and transmitters of IAVs, routine IAV surveillance in free-grazing duck flocks can be beneficial for influenza prevention and control strategies.
Copyright ? 2015 Elsevier B.V. All rights reserved.
KEYWORDS:
Free-grazing duck; Influenza A; Sentinel; Thailand
PMID: 26711026 [PubMed - in process]