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PBFD (Psittacine Beak and Feather Disease)

By Alyson Burgess, About.com

Definition: Psittacine Beak and Feather Disease (PBFD) is a virus that can infect any hookbill. The disease attacks the bird's feathers, beak, and internal systems including the immune system. Outward symtoms include feather loss and abnormal beak growth.

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