title: Nationwide survey of bovine leukemia virus infection among dairy and beef breeding cattle in Japan from 2009-2011.
abstract: A nationwide survey of bovine leukemia virus (BLV) infection was conducted among dairy and beef breeding cattle in Japan from 2009-2011 using an enzyme-linked immunosorbent assay. Of a total of 20,835 cattle tested, 35.2% were seropositive for BLV and the animal type-level seroprevalences in dairy and beef breeding cattle were 40.9 and 28.7%, respectively. By the time animals were 1 year old, 21.0% of dairy and 13.7% of beef breeding cattle were considered infected. Our findings indicate that BLV is widespread among dairy and beef breeding cattle in Japan with the BLV seroprevalences approximately 10- and 4-fold higher, respectively, than previously reported for 1980-1982 in Japan.
authors.affiliation: Viral Disease and Epidemiology Research Division, National Institute of Animal Health, 3-1-5 Kannondai, Tsukuba, Ibaraki 305-0856, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Murakami
authors.forename: Sota
authors.initials: S
authors.lastname: Kobayashi
authors.forename: Misako
authors.initials: M
authors.lastname: Konishi
authors.forename: Ken-ichiro
authors.initials: K
authors.lastname: Kameyama
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Tsutsui
mesh_terms: D000367:Age Factors; D000818:Animals; D002417:Cattle; D016583:Enzootic Bovine Leukosis / Q000453:epidemiology*; D004797:Enzyme-Linked Immunosorbent Assay / Q000662:veterinary; D005843:Geography; D007564:Japan / Q000453:epidemiology; D001909:Leukemia Virus, Bovine; D016036:Seroepidemiologic Studies