Fig. 4From: Longitudinal piglet sampling in commercial sow farms highlights the challenge of PRRSV detectionFARM D. PRRSV RNA detection (,) by week (W), farrowing room (R), and specimen (P - processing fluid, F - family oral fluid).). aNo. RNA positive samples (+) and no. samples collected (∑). PRRSV RFLP 1–7-4 detectedBack to article page