Seroprevalence survey of H9N2 avian influenza virus in backyard chickens around the Caspian Sea in Iran

摘要: Since 1998, an epidemic of avian influenza occurred in the Iranian poultry industry. The identified agent presented low pathogenicity, and was subtyped as H9N2 virus. Backyard chickens can play important role epidemiology virus infection. Close contact backyard with migratory birds, especially aquatic well neighboring farms, may pose risk transmitting virus, but little is known about disease status poultry. A seroprevalence survey carried out 700 from villages around Caspian Sea, Northern Iran, using hemagglutination-inhibition (HI) test. studied had not been previously vaccinated showed no clinical signs disease. mean antibody titers found were 6.8, 7.5, 5.9, 7.2, 5.7, 6.4, 6.2 76.2%, 79.5%, 68.18%, 78.27%, 65%, 72.31% 71.4% seven villages. Overall HI titer against 6.52 72.98%, respectively.