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Table 4 Score of gross and histological pulmonary lesions due to interstitial pneumonia modified after Halbur et al. [23] in pigs challenged with an HP PRRSV 2 field strain (n = 10 per group) (Median (1st; 3rd quartile))

From: Efficacy of live attenuated porcine reproductive and respiratory syndrome virus 2 strains to protect pigs from challenge with a heterologous Vietnamese PRRSV 2 field strain

  Group 1 Group 2
Gross pulmonary lesions 14.5 (9.0; 20.8)a 36.5 (26.5; 57.3)b
Interstitial pneumonia 1.5 (1.0; 2.0)a 3.0 (2.0; 3.0)b
  1. Group 1 – pre-vaccinated with an experimental PRRSV 2 live vaccine
  2. Group 2 – not pre-vaccinated
  3. Significant differences (P < 0.05) between the groups are indicated with different letters