title: Bovine respiratory syncytial virus seroprevalence and risk factors in endemic dairy cattle herds.
abstract: The herd seroprevalence of bovine respiratory syncytial virus (BRSV) was studied in 59 dairy cattle herds using serology on random selected animals stratified by two age classes (heifers, cows). Risk factors for primary infections in heifers were investigated using a questionnaire on management conditions and data on bovine viral diarrhoea (BVD) status. At least one seropositive cow was present in all the herds. In 25% of the herds all individual were seropositive and 22% of herds had all heifers seronegative. Analysis of the influence of risk factors retained summer pasture and BVD status. In particular, absence of summer pasture and the BVD positive status of heifers were associated with an increased risk of BRSV infection in heifers group.
authors.affiliation: Università degli Studi di Milano, Dipartimento di Patologia Animale, Igiene e Sanità Pubblica Veterinaria, Via Celoria 10, 20133, Milano, Italia. camilla.luzzago@unimi.it
authors.forename: Camilla
authors.initials: C
authors.lastname: Luzzago
authors.forename: Valerio
authors.initials: V
authors.lastname: Bronzo
authors.forename: Stefano
authors.initials: S
authors.lastname: Salvetti
authors.forename: Michela
authors.initials: M
authors.lastname: Frigerio
authors.forename: Nicola
authors.initials: N
authors.lastname: Ferrari
mesh_terms: D000367:Age Factors; D000818:Animals; D001912:Bovine Virus Diarrhea-Mucosal Disease / Q000150:complications / Q000453:epidemiology; D002417:Cattle; D003612:Dairying; D005260:Female; D030243:Hemorrhagic Syndrome, Bovine / Q000150:complications / Q000453:epidemiology; D018357:Respiratory Syncytial Virus Infections / Q000453:epidemiology / Q000209:etiology / Q000662:veterinary*; D018112:Respiratory Syncytial Virus, Bovine / Q000276:immunology*; D012307:Risk Factors; D016036:Seroepidemiologic Studies