Infection Paths
PBFD is usually acquired by nestlings from their parents (vertical transmission) or from other members of the flock (horizontal transmission). The immature immune system of young birds makes them susceptible to the PBFDV. The virus may be transferred in crop secretions, in fresh or dried feces, and in feather and skin particles.
Adult birds coming into contact with the virus usually (but not always) develop resistance to it, but the virus is retained in their body and, in most cases, is excreted in feces and feather debris for the rest of their lives.
Read more about this topic: Psittacine Beak And Feather Disease
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