Psittacine Beak and Feather Disease (PBFD) - Part 2

Circovirus Clinical Presentations


Clinical Signs

Bird Species


Sudden death often with enteritis, pneumonia, weight loss.

Young birds especially Eclectus, Cockatoos, African Greys.


Replacement of the neonatal down with dystrophic feathers. May have depression and illness for 1-2 weeks. Death over 1 week to 1 month.

All species especially Cockatoos, Budgerigars (French Moult) and Lovebirds.


Progressive appearance of abnormally developed feathers. Abnormal beak growth. Immunodeficiency. Death in 6 months to 5 years.

All species especially Cockatoos.

Low incidence of disease. Resistance without antibodies seen.

No clinical signs and no antibodies despite exposure to the virus in environment.

Cockatiels of all ages. Many immunocompetent adult birds of all species.

Recovering carriers

Over next 1-2 moults may recover or may have some lingering feather signs. Usually have antibodies and antigen.

Lorikeets, Budgerigars, Lovebirds

Full recovery after clinical signs.

Peracute, acute and early chronic cases. Usually have antibodies present.

All species

Non-parrot Circovirus

(does not cause PBFD)

Non-PBFD Circovirus found in non-Psittacines with no feather changes.

Chicken Anaemia

Circovirus in pigeons






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