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Chicken Infectious Anemia
Other Names: Blue Wing Disease, Anemia Dermatitis, Hemorrhagic Syndrome
Chicken infectious anemia (CIA) is a disease of young chicks caused by the chicken anemia virus (CAV). The disease is characterized by aplastic anemia and generalized lymphoid atrophy with concomitant immunosuppression. It is frequently complicated by secondary viral, bacterial, or fungal infections. The disease is controlled by vaccination of breeder chickens so that they can pass on the maternal antibodies to chicks and thus protect them from exposure to the virus in the ﬁeld.
One of the most specific signs related to CIA is that affected birds will develop anemia about 10-14 days after their first infected. The hematocrit values will typically range from 6 to 27%. They will become pale and depressed. The course of the disease is about 12 to 28 days.
CIAV spreads both vertically and horizontally. Infected chicks will shed high concentrations of the virus in their feces for 5-7 weeks, which other chickens can ingest from fecal contamination of the environment, feed, or water source. It typically takes about 2-4 weeks for the entire flock to become infected. Subclinical infections are frequently observed in commercial flocks.