Bovine respiratory syncytial virus seroprevalence and risk factors in endemic dairy cattle herds |
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| Authors: | Camilla Luzzago Valerio Bronzo Stefano Salvetti Michela Frigerio Nicola Ferrari |
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| Institution: | 1.Università degli Studi di Milano, Dipartimento di Patologia Animale, Igiene e Sanità Pubblica Veterinaria,Milano,Italia;2.Brescia,Italia;3.Lecco,Italia |
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| 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. |
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