Peer-reviewed veterinary case report
Field efficacy of HVT-H9 vaccination after natural infection of H9N2 avian influenza virus in broilers.
- Journal:
- Veterinary microbiology
- Year:
- 2023
- Authors:
- Chen, Yu et al.
- Affiliation:
- College of Veterinary Medicine · China
- Species:
- bird
Abstract
H9N2 subtype avian influenza virus (AIV) has been persistently circulating in China. It causes huge economic losses to the poultry industry and poses a great threat to public health. Previously, we constructed a turkey herpesvirus live vector vaccine candidate strain expressing an H9 gene, HVT-H9. Results showed that immunisation with HVT-H9 could provide good immunity in specific pathogen free (SPF) chickens. In this study, field-bred Arbour Acres plus (AA+) broilers were additionally immunised with HVT-H9 at one day of age. Then, broilers were naturally infected with H9N2 AIV. During the endemic period, death occurred in flocks without HVT-H9 immunisation and the mortality rate increased rapidly, forming a clear death wave. However, HVT-H9 vaccination prevented broiler mortality. Etiological tests and serological tests showed that broilers were positive for H9N2 AIV. Collectively, HVT-H9 immunisation provided good immunity for broilers in the field by inhibiting H9N2 virus infection and transmission.
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Search related cases →Original publication: https://pubmed.ncbi.nlm.nih.gov/36516606/