Chicken anaemia virus, or CAV, is currently a member of the anelloviridae family which is found worldwide. The virus only affects chickens. 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.
It causes bone marrow atrophy, anaemia, and severe immunosuppression. Clinical signs of CAV infection are predominantly found in young chicks.
Clinical disease is rare today because of the widespread practice of vaccinating breeders, but the subclinical form of the disease is ubiquitous. The virus is very resistant in the environment, making elimination very difficult.