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Derzsy's Disease

Muscovy Duck Parvovirus, Gosling Plague, Goose Influenza, Infectious Myocarditis, Goose Parvovirus Infection

Derzsy’s disease, also referred to as Muscovy duck parvovirus, is a highly contagious disease of domestic goslings and muscovy ducklings, caused by a type of parvovirus. The disease can present in acute, subacute or chronic form. Clinical signs differ depending on the form of the disease.

Derzsy’s disease is spread to birds vertically (from breeder duct to egg), and horizontally (from direct contact with an infected bird or indirect contact through environmental contamination of an infected bird's feces. Survivors of the disease and goslings that were initially infected when they were older then 4 weeks of age can often become persistent carriers of the virus.


Loss of appetite
Increased thirst
Reluctance to move
Eye and/or nasal discharge
Swollen eyelids
White diarrhea
Enlarged abdomen
Penguin-like posture
Stunted growth
Skin reddening
Death in 2-5 days


  • History - Age of affected birds
  • Clinical signs
  • Physical exam
  • Virus isolation
  • Serology
  • Virus neutralization
  • ELISA - for detecting viral antigen (antigen capture or double antibody sandwich)
  • PCR


MethodMethod Summary
Supportive careIsolate the bird from the flock and place in a safe, comfortable, warm location (your own duck "intensive care unit") with easy access to water and food. Limit stress. Call your veterinarian.



Risk Factors

  • Mixing eggs from different flocks in incubators or hatchers.
  • Poor hatchery or brooder hygiene