title: An investigation of duck circovirus and co-infection in Cherry Valley ducks in Shandong Province, China.
abstract: The co-infection of duck circovirus (DuCV) with Riemerella anatipestifer (RA) or/and Escherichia coli (E. coli) or/and duck hepatitis virus I (DHV-I) in Cherry Valley ducks in China's Shandong Province was investigated by using polymerase-chain-reaction (PCR)-based methods. For this study, 742 ducks sampled at random from 70 duck farms during 2006-2007 were examined using PCR and dot-blot hybridisation (DBH) tests. Overall the DuCV infection rate was 33.29%. Compared with those at 2 weeks of age, the ducks at 3-4 weeks of age were more susceptible to DuCV infection. Compared with the DuCV-negative ones, the DuCV-positive ducks had a higher rate of infection by DHV-I (25.5% vs. 7.475%), RA (23.48% vs. 8.28%) and E. coli (16.19% vs. 4.85%). This investigation shows that DuCV infection is common in Cherry Valley ducks on some farms in Shandong Province.
authors.affiliation: College of Animal Science and Veterinary Medicine, Research Center for Animal Disease Control Engineering, Shandong Province, Shandong Agricultural University, Tai'an, Shandong 271018, China.
authors.forename: Xingxiao
authors.initials: X
authors.lastname: Zhang
authors.forename: Shijin
authors.initials: S
authors.lastname: Jiang
authors.forename: Jiaqiang
authors.initials: J
authors.lastname: Wu
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhao
authors.forename: Yani
authors.initials: Y
authors.lastname: Sun
authors.forename: Yibo
authors.initials: Y
authors.lastname: Kong
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Li
authors.forename: Meiling
authors.initials: M
authors.lastname: Yao
authors.forename: Tongjie
authors.initials: T
authors.lastname: Chai