Fig. 5
From: Longitudinal piglet sampling in commercial sow farms highlights the challenge of PRRSV detection
FARM E. PRRSV RNA detection (
,
) by week (W), farrowing room (R), and specimen (P - processing fluid, F - family oral fluid, S - Serum). aNo. RNA positive samples (+) and no. samples collected (∑). 
PRRSV RFLP 1–8-4 detected (also at week-1, data not shown)