AI Article Synopsis

  • Wild birds, particularly Mandarin ducks and domestic pigeons, play a crucial role in the spread and evolution of highly pathogenic avian influenza viruses (HPAIV), specifically the H5N8 strain.
  • In the study, infected Mandarin ducks showed no clinical symptoms but effectively transmitted the virus to other ducks, while pigeons had shorter shedding periods and did not transmit the virus to each other.
  • The presence of the virus was confirmed in multiple organs of the infected birds, indicating that they can carry H5N8 HPAIV without appearing sick, suggesting they could act as healthy reservoirs for the virus.

Article Abstract

Wild birds play a major role in the evolution, maintenance, and dissemination of highly pathogenic avian influenza viruses (HPAIV). Sub-clinical infection with HPAI in resident wild birds could be a source of dissemination of HPAIV and continuous outbreaks. In this study, the pathogenicity and infectivity of two strains of H5N8 clade 2.3.4.4 virus were evaluated in the Mandarin duck (Aix galericulata) and domestic pigeon (Columba livia domestica). None of the birds experimentally infected with H5N8 viruses showed clinical signs or mortality. The H5N8 viruses efficiently replicated in the virus-inoculated Mandarin ducks and transmitted to co-housed Mandarin ducks. Although relatively high levels of viral shedding were noted in pigeons, viral shedding was not detected in some of the pigeons and the shedding period was relatively short. Furthermore, the infection was not transmitted to co-housed pigeons. Immunohistochemical examination revealed the presence of HPAIV in multiple organs of the infected birds. Histopathological evaluation showed the presence of inflammatory responses primarily in HPAIV-positive organs. Our results indicate that Mandarin ducks and pigeons can be infected with H5N8 HPAIV without exhibiting clinical signs; thus, they may be potential healthy reservoirs of the H5N8 HPAIV.

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Source
http://dx.doi.org/10.1016/j.vetmic.2017.03.003DOI Listing

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