Proposing a clinical case definition for porcine reproductive and respiratory syndrome virus outbreaks in sow herds based on key productivity indicators

Infection with porcine reproductive and respiratory syndrome virus (PRRSV) in breeding herds causes significant changes in key production indicators (KPIs). Still, the swine industry lacks a clinical case definition for PRRSV outbreaks based on KPIs, hindering early detection and outbreak characterization. This study analyzed data from 75 outbreaks resulting in a definition based on KPI signals and diagnostic insights. An Excel tool for decision makers was created avoiding complex statistical methods. Using a 15-week moving average and a 2 SD threshold minimized false negatives and false positives, enabling proactive management and early outbreak detection through a reliable, accessible framework.