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. 2010 Jul 15;147(3):329–339. doi: 10.1016/j.vetmic.2010.07.005

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Fig. 3 — Frequency of PRRS-seropositive sows during gestation and lactation phases in five farrow-to-finish herds (184 sows, 3 sampling dates). wBFar01: 9 weeks before farrowing, replicate 01; 4wAFar01: 4 weeks after farrowing, replicate 01; 4wAFar02: 4 weeks before farrowing, replicate 02.