5Christopher J K, Yamaguchi T, Wambura P N, et al. Detection of infectious burs,al disease virus (IBDV) genome in free-living pigeon and guinea fowl in Africa suggests involvemett of wild birds in the epidemiology of IBDV[J]. Virus Genes, 2008, 36:521-529.
6Jeon W J, Lee E K, Joh S J, et al. Very virtdent infectious bursal disease virus isolated from wild birds in Korea: epidemiological im- plications[J]. Virus Res, 2008, 137(1) : 153-156.