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Chicken anaemia virus, or CAV, is a member of the circoviridae family. It is a non-enveloped icosahedral single stranded DNA virus. Infection causes anaemia, bone marrow atrophy, and severe immunosuppression in poultry as the virus affects the production of red blood cells (RBC), white blood cells (WBC) and platelets. Clinical signs of CAV infection are predominantly found in young chicks due to vertical transmission from the breeder hens whose maternal antibodies have not yet formed following exposure. Clinical disease is rare today because of the widespread practice of vaccinating breeders, but the subclinical form of the disease - which normally affects birds more than two weeks of age following horizontal transmission of the virus via the oro-faecal route - is ubiquitous. Additionally, the virus is very resistant in the environment, making elimination very difficult. It is not a zoonosis. The vaccine has the ATCvet code The disease/virus has many names including chicken anaemia, blue wing disease, anaemia dermatitis syndrome, chicken/avian infectious anaemia, haemorrhagic aplastic anaemia syndrome, infectious chicken anaemia, chicken infectious anaemia virus and chicken anaemia agent. ==Clinical signs and diagnosis== Clinical signs include a pale comb, wattle, eyelids, legs and carcass, anorexia, weakness, stunting, unthriftiness, weight loss, cyanosis, petechiation and ecchymoses, lethargy and sudden death. Neurological signs include dullness, depression and paresis. Subclinical infection my cause reduced growth rates and other health problems. A presumptive diagnosis can be made based on the clinical signs and a low haematocrit reading (<27%). Virus isolation, increased antibody titres, immunoperoxidase staining, ELISA, PCR or indirect immunofluorescence can be used to confirm the presence of the virus. Post mortem finding should show significant atrophy of the lymphoid organs, haemorrhage throughout the tissues and pale watery bone marrow. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chicken anaemia virus」の詳細全文を読む スポンサード リンク
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