Psitticine Beak and Feather Disease (PBFD) is a chronic disease characterized by feather dystrophy and loss, beak deformity and ultimately, death. It is caused by a non-enveloped icosahedral DNA virus, the Psitticine Beak and Feather Disease virus. PBFD virus usually infects birds less than 3 years of age. The virus is spread from mother to egg or directly to chicks. Viral particles can be spread in feather dust carried by air currents, dried feces or even on the clothing of human handlers.