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Table 1 Characteristics of sow herds participating in the studya

From: Longitudinal piglet sampling in commercial sow farms highlights the challenge of PRRSV detection

  Farm A Farm B Farm C Farm D Farm E Farm F
Sow inventory 3000 3000 3000 3000 6000 3300
Distance to the nearest farm 800 m 8 km 800 m 3.2 km >  32 km 2.4 km
Farrowing rooms (crates/room) 18 (28) 15 (24) 14 (28) 20 (32) 20 (56) 13 (56)
Most recent PRRSV outbreak 18 months 6 months 6 months 6 months 3 months 5 months
PRRSV RFLP patternb 1–7-4 1–10-4 1–7-4 1–7-4 1–8-4 1–7-4
PRRSV control
 - PRRSV MLV Quarterly Quarterly Quarterly Quarterly Yes No
 - Live virus inoculation No No No No Yes Yes
 - Shower in/shower out Yes Yes Yes Yes Yes Yes
 - Supplies disinfected at entry Yes Yes Yes Yes Yes Yes
 - Gilt quarantine Yes No Yes No Yes Yes
Surveillance specimens
 - Processing fluids (PF)
  Weeks sampled 1–19 1–19 1–19 1–19 1–38 1–18
  Total PF samples 87 83 74 94 167 56
 - Family oral fluids (FOF)
  Weeks sampled 9–11, 13 11–14, 16–19 13–19 12–18 3–5, 7–8, 10–12, 14–16, 18, 20–22, 25–31, 33 1–9, 11, 12, 14–17
  Total FOF samples 109 480 439 573 498 301
 - Serum
  Sampling period (weeks) Not done Not done Not done Not done 14, 18, 22, 24–31, 33 8, 12
  Total pooledc serum samples      108 12
  1. a All farms endemically infected with PRRSV, used commercial modified live vaccine (MLV) and/or live PRRSV inoculation (LVI), and practiced continuous farrowing
  2. b Based on PRRSV ORF5 sequencing
  3. c Pools of 5 serum samples