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Table 2 Percentage of gilts who were seropositive for PRRSV based on ELISA

From: Initial vaccination and revaccination with Type I PRRS 94881 MLV reduces viral load and infection with porcine reproductive and respiratory syndrome virus

Day Group % seropositive (95% CI) P-value (vs challenge control) P-value (vs revaccination)
0 Challenge control 0
Revaccination 0
Single vaccination 0
14 Challenge control 0 (0.0, 20.6) N/A  
Revaccination 25 (7.3, 52.4) 0.101 N/A
Single vaccination 0 (0.0, 20.6) ND 0.101
21 Challenge control 0 (0.0, 20.6) N/A  
Revaccination 56 (29.9, 80.2) 0.0008 N/A
Single vaccination 0 (0.0, 20.6) ND 0.0008
56 Challenge control 0 (0.0, 20.6) N/A  
Revaccination 69 (41.3, 89.0) 0.0001 N/A
Single vaccination 0 (0.0, 20.6) ND 0.0001
70 Challenge control 0 (0.0, 20.6) N/A  
Revaccination 69 (41.3, 89.0) 0.0001 N/A
Single vaccination 69 (41.3, 89.0) 0.0001 1.0000
77 Challenge control 0 (0.0, 20.6) N/A  
Revaccination 69 (41.3, 89.0) 0.0001 N/A
Single vaccination 94 (69.8, 99.8) < 0.0001 0.172
91 Challenge control 0 (0.0, 20.6) N/A  
Revaccination 56 (29.9, 80.2) 0.0008 N/A
Single vaccination 94 (69.8, 99.8) < 0.0001 0.0373
  1. Challenge control group (n = 16); Revaccination group (n = 16); Single-vaccination group (n = 16)
  2. PRRS serology was assessed using ELISA
  3. CI confidence interval, ELISA enzyme-linked immunosorbent assay, N/A not applicable, ND not determined, PRRSV Porcine reproductive and respiratory syndrome virus