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Table 3 Serum viral neutralization test results using type 1 and type 2 PRRSV

From: Vaccination of sows against type 2 Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) before artificial insemination protects against type 2 PRRSV challenge but does not protect against type 1 PRRSV challenge in late gestation

  Against type 1 PRRSV Against type 2 PRRSV
  Days of gestation Days of gestation
Group 93 100 107 114 93 100 107 114
1 0/5* 0/5 2/5a 3/5 0/5 2/5 3/5 5/5
0.40 ± 0.79 1.73 ± 0.85 2.29 ± 0.41b 2.21 ± 0.19 0.25 ± 0.50 2.11 ± 0.19 2.26 ± 0.49 2.75 ± 0.50
2 0/5 0/5 0/5 1/5 0/5 3/5 4/5 5/5
0.25 ± 0.50 0.75 ± 0.50 1.29 ± 0.34 2.05 ± 0.07c 0.25 ± 0.50 2.34 ± 0.46* 3.51 ± 0.56* 3.75 ± 0.50*
3 0/5 0/5 2/5 3/5 0/5 1/5 1/5 2/5
- 1.15 ± 0.29 2.01 ± 0.02 2.19 ± 0.34 - 2.02 ± 0.02 2.01 ± 0.01 2.11 ± 0.18
4 0/5 0/5 0/5 1/5 0/5 1/5 2/5 4/5
  - 0.50 ± 0.58 1.15 ± 0.29 2.02 ± 0.02 - 2.01 ± 0.01 2.00 ± 0.01* 2.97 ± 0.53*
  1. aNumber of positive/negative sows.
  2. bMean titers (log2) and standard deviation. Mean titers have been calculated as the arithmetic mean of positive sera only.
  3. cRepeated value of single positive sample.
  4. *Statistical difference (P < 0.05) for neutralizing activity against type 1 PRRSV and against type 2 PRRSV at the same days of gestation.