Risk factors for infectious bronchitis virus infection in laying flocks in three provinces of Korea: preliminary results
2005
Pak, S.I. (Kangwon National University, Chunchon, Republic of Korea), E-mail: paksi@kangwon.ac.kr | Song, C.S. (Konkuk University, Seoul, Republic of Korea) | Mo, I.P. (Chungbuk National University, Cheongju, Republic of Korea) | Song, C.Y. (Boram Animal Hospital, Pyungtaek, Republic of Korea) | Kwon, H.M. (Kangwon National University, Chunchon, Republic of Korea) | Yoon, H.J. (Kangwon National University, Chunchon, Republic of Korea) | Son, Y.H. (Konkuk University, Seoul, Republic of Korea)
To analyze and identify selected risk factors for infectious bronchitis virus (IBV) infection in the growing and laying period of laying-hen flocks, a longitudinal field study was conducted with 27 commercial flocks reared in three provinces of Korea during the period from May 2003 to April 2004. Using monitored data for IBV infection status among study flocks we computed the multivariate odds ratios (ORs) and their corresponding confidence intervals (CIs), and population attributable risks (PARs). Multivariate logistic regression showed significant risk increments for: continuous entry of chick (OR=1.9, 95% CI, 0.7-69.1) and operation years of the layer house greater than or equal to 5 years (OR=3.2, 95%CI, 1.6-389.9).
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