Avian Bornavirus / Proventricular Dilatation Disease (PDD)

What is it?

PDD is a disease of the nerves supplying the digestive tract, linked to avian bornavirus. Food moves poorly through the gut. Many birds carry the virus without becoming sick.

What signs should I watch for?

Signs to watch for include regurgitation, undigested seeds in droppings, weight loss despite eating, and neurologic signs such as weakness or poor balance.

How is it diagnosed and treated?

X-rays, blood work, and bornavirus testing suggest the diagnosis; biopsy can confirm it. Management is supportive, including anti-inflammatory therapy and easily digested foods.

Can it be prevented, and what's the outlook?

• There is no cure, but some birds live for years with management.
• Quarantine and testing of new birds are important.