Prevalence of Bovine Norovirus and Nebovirus and Risk Factors of Infection in Swedish Dairy Herds

Enteritis is the major cause of mortality in neonatal calves. Diagnostic work to detect pathogens involved and identification risk factors for such infections are imperative improve calf health. Bovine norovirus (BNoV) nebovirus prevalence was investigated using RT-PCR 50 dairy herds five geographic regions Sweden. BNoV were found be common young detected 20% 250 calves 48% herds. Nebovirus 5% 16% Both present three (6%). BNoV-infected younger (median age 7 days) than nebovirus-infected 21 days). These not adult cows stock over 6 months tested selected Risk identified infection a high number preweaned at time sampling, colostrum uptake by suckling dam only, kept single pen, location herd, while no multivariable analysis. Univariable analysis suggested early separation from dam.