| encephalomyelitis virus, avian | A species of enterovirus infecting primarily young chicks, but also found in turkeys, pheasants, and guinea fowl. It causes a fatal neuronal degeneration and is transmitted by mechanical contact. (12 Dec 1998) |
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| erythroblastosis virus, avian | A species of avian type c retroviruses (retroviruses type c, avian) causing progressive anaemia and weakness in domestic and wild fowl. (12 Dec 1998) |
| tuberculosis, avian | A variety of tuberculosis affecting various birds, including chickens and ducks. It is caused by mycobacterium avium and characterised by tubercles consisting principally of epithelioid cells. It may be transmitted to other animals including man. (12 Dec 1998) |
| leukosis virus, avian | The type species of avian type c retroviruses (retroviruses type c, avian) producing latent or manifest lymphoid leukosis in fowl. (12 Dec 1998) |