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Expected risk (probability) of PCVAD in the Ontario study population containing 278 herds based on a generalized additive model with a smooth bivariate term for herd locations (Ps(x, y) = 0.05) and porcine reproductive and respiratory syndrome (PRRS) virus herd status (P < 0.01). The map shows the expected risk in PRRS-positive farms as a simple linear trend with decreasing risk in the western direction.
