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Duck Haemorrhagic Oophoritis (DHO)

Duck Haemorrhagic Oophoritis (DHO) is a mosquito-borne disease that has a significant impact on the egg production industry in China. The disease is caused by the duck tembusu virus (DTMUV) and can affect several different duck breeds--the Pekin duck, Cherry Valley Pekin duck, Shaoxing duck, Jinyun duck, Longyan duck, Jinding duck and Khaki-Campbell duck. The virus was first reported in 1957 in Kuala Lumpur, Malaysia.

DTMUV causes damage to the duck's reproductive system, specifically the ovaries. It also causes interstitial inflammation in the portal areas of livers, resulting in liver damage.


Reduced feed uptake
Decrease in egg production
Twisted neck
Stunted growth


  • History
  • Clinical signs
  • Physical exam
  • Laboratory tests


MethodMethod Summary
Supportive care


  • Biosecurity
  • Quarantine new ducks prior to introducing them to the rest of the flock
  • Reduce exposure to mosquitoes


Risk Factors

  • High populations of mosquitoes