. 2018 Apr 19;14:133. doi: 10.1186/s12917-018-1451-y

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))

	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

Group 1 – pre-vaccinated with an experimental PRRSV 2 live vaccine

Group 2 – not pre-vaccinated

Significant differences (P < 0.05) between the groups are indicated with different letters