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Updated: Jan 11, 2026

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Spillover of Riemerella anatipestifer to laying hens leads to a decrease in egg production and hatchability.

Wanting Zhou1, Xuezhi Cui2, Shuning Zhou3

  • 1China Animal Health and Epidemiology Center, Qingdao, China; Shandong Sinder Technology Co., Ltd., Qingdao, Shandong, China.

Poultry Science
|November 11, 2025
PubMed
Summary

A Riemerella anatipestifer strain, typically infecting ducks, was found in egg-laying hens. This bacterium impacts egg production and hatching, necessitating urgent surveillance in the poultry industry.

Keywords:
DecreaseEgg productionHatchabilityLaying hensRiemerella anatipestifer

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Area of Science:

  • Veterinary Microbiology
  • Poultry Diseases
  • Bacterial Pathogenesis

Background:

  • Riemerella anatipestifer commonly infects ducks and geese.
  • Emergence of novel bacterial strains in poultry can pose significant economic threats.
  • The layer industry is particularly vulnerable to reproductive tract infections.

Purpose of the Study:

  • To characterize a novel Riemerella anatipestifer isolate from a layer hen.
  • To investigate the pathogenicity and genetic relatedness of the isolate.
  • To assess the epidemiological spread and potential impact on the poultry industry.

Main Methods:

  • Bacterial isolation and identification from a layer hen.
  • Genetic analysis of housekeeping genes (16S rRNA, rpoB), virulence genes (prtC, hagA, sspA), and ompA.
  • Animal studies to replicate clinical signs and pathology.
  • Epidemiological investigation across multiple provinces.

Main Results:

  • The isolate was identified as Riemerella anatipestifer, genetically related to strains from eastern China.
  • Animal models showed decreased egg production and hatching rates, with oviduct lesions.
  • The disease has been detected in chicken farms across at least 5 provinces.

Conclusions:

  • Riemerella anatipestifer poses a new threat to the layer industry.
  • Urgent enhanced surveillance is required to monitor and control its spread.
  • Preventative measures are crucial to mitigate economic losses in the poultry sector.