Frontiers in Microbiology (Nov 2022)

Pathogenicity and transmissibility studies on live attenuated duck enteritis virus vaccine in non-target species

  • Jie Kong,
  • Jie Kong,
  • Jie Kong,
  • Keyu Feng,
  • Keyu Feng,
  • Keyu Feng,
  • Keyu Feng,
  • Qiqi Zhao,
  • Qiqi Zhao,
  • Qiqi Zhao,
  • Yazheng Chen,
  • Yazheng Chen,
  • Yazheng Chen,
  • Jinfeng Wang,
  • Jinfeng Wang,
  • Jinfeng Wang,
  • Sheng Chen,
  • Sheng Chen,
  • Sheng Chen,
  • Guanming Shao,
  • Guanming Shao,
  • Guanming Shao,
  • Liqin Liao,
  • Liqin Liao,
  • Liqin Liao,
  • Yajuan Li,
  • Yajuan Li,
  • Yajuan Li,
  • Zi Xie,
  • Zi Xie,
  • Zi Xie,
  • Xinheng Zhang,
  • Xinheng Zhang,
  • Xinheng Zhang,
  • Xinheng Zhang,
  • Qingmei Xie,
  • Qingmei Xie,
  • Qingmei Xie,
  • Qingmei Xie

DOI
https://doi.org/10.3389/fmicb.2022.979368
Journal volume & issue
Vol. 13

Abstract

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In the second half of 2021, a highly pathogenic case occurred in a mixed chicken and duck family farm in Guangdong, China. After the duck flocks were immunized with live attenuated duck enteritis virus vaccine (live attenuated DEV vaccine), the chickens of the same farm showed clinical symptoms similar to duck enteritis, such as pericardial effusion, hepatic hemorrhagic spots, kidney enlargement, and intestinal bleeding, with mass mortality. The infection model of target animal tested, as well as the non-target species, was established according to the risk of live attenuated DEV vaccine and transmission in chickens. Live attenuated DEV vaccine was initially replicated in host animals, released the virus, and effectively colonized in the common environment, according to birds challenged experiments. There was evidence to suggest the mode of transmission of duck enteritis virus, and horizontal transmission is the main route of DEV transmission. In addition, high levels of virus titer were detected in chicken embryos and different tissues of SPF chickens. Different degrees of pathological damage occurred in the tissue of chickens. After the SPF chickens were inoculated with live attenuated DEV vaccine, different degrees of virulence were exhibited, pointing to a potential risk to other domestic bird species.

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