Figure 1From: Salmonella dublinin Danish Dairy Herds: Frequency of Change to Positive Serological Status in Bulk Tank Milk ELISA in Relation to Serostatus of Neighbouring FarmsComparison of prevalence and mean geographical risk-scores. For each area the calculated prevalence are compared to the mean GR-risk scores given to herds testing negative in all test-rounds, and the herds changing from test-negative to test-positive respectively.Back to article page