tetano
Editor, Senior Moderator
Vet Microbiol
. 2022 Dec 9;276:109624.
doi: 10.1016/j.vetmic.2022.109624. Online ahead of print.
Field efficacy of HVT-H9 vaccination after natural infection of H9N2 avian influenza virus in broilers
Yu Chen[SUP] 1 [/SUP], Hongyu Zhao[SUP] 1 [/SUP], Honglei Sun[SUP] 1 [/SUP], Jinhua Liu[SUP] 2 [/SUP], Litao Liu[SUP] 3 [/SUP]
Affiliations
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.
Keywords: Broiler; Field efficacy; H9N2 AIV; HVT-H9; Natural infection; Vaccination.
. 2022 Dec 9;276:109624.
doi: 10.1016/j.vetmic.2022.109624. Online ahead of print.
Field efficacy of HVT-H9 vaccination after natural infection of H9N2 avian influenza virus in broilers
Yu Chen[SUP] 1 [/SUP], Hongyu Zhao[SUP] 1 [/SUP], Honglei Sun[SUP] 1 [/SUP], Jinhua Liu[SUP] 2 [/SUP], Litao Liu[SUP] 3 [/SUP]
Affiliations
- PMID: 36516606
- DOI: 10.1016/j.vetmic.2022.109624
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.
Keywords: Broiler; Field efficacy; H9N2 AIV; HVT-H9; Natural infection; Vaccination.