A questionnaire study of associations between potential risk factors and salmonella status in Swedish dairy herds

摘要: In this study associations between potential risk factors and salmonella status in Swedish dairy herds were investigated. A case-control design was used, including existing as well new cases. Herds assigned a on the basis of antibody analysis bulk milk samples. Information collected from registry data farmers via questionnaire. Univariable multivariable logistic regression analyses used to investigate factors. addition, multivariate with Additive Bayesian Network (ABN) modelling performed improve understanding complex relationship all variables. Because difficulty identifying infections low prevalence large regional variation, exposure high-prevalence region (Oland) compared other regions Sweden. total 483 996 (48%) responded questionnaire, 69 had test-positive The strongest association 'presence <5 km' (OR 4.3, 95% CI 2.0-9.4). Associations also seen 'feeding calves residue only' 2.4, 1.2-4.6), 'certified organic herds' 2.5, 1.2-4.9) 'frequently seeing signs rodents' 0.4, 0.13-0.97). ABN model showed Oland four variables: status, presence <5km, shared pastures providing protective clothing for visitors. latter is probably reflection increased disease awareness Oland. herd size housing several management procedures. This provides an explanation why frequently has been identified factor by studies. confirms importance local transmission routes salmonella, but does not identify specific components spread. Therefore, it supports use broad biosecurity approach prevention salmonella. Oland, some are more common than parts Theoretically these could contribute spread confirmed present study. highlights variation.