Fig. 5.

Histopathological features of lung and thymus, and microscopic lesion scores for tissue samples from PRRSV-infected pigs. Pigs fed 0.3% GB (B) had milder cases of interstitial pneumonia at 12 DPI (based on lung histopathological features) compared to the control animals (A). Additionally, lymphoid depletion was less severe in the 0.3% GB-fed group, and clearer separation between the cortex and medulla of the thymus (D) compared to the control group (C) was observed. Lung (LUN) microscopic lesion scores for pigs fed 0.3% GB were significantly decrease compared to those for the control group (^*p < 0.05). Moreover, microscopic lesion scores for the lymphoid tissues [bronchial lymph node (BLN), tonsil (TON), and thymus (THY)] from the 0.3% GB-fed group were lower than those for the control group although this difference was not significant. Scale bar = 100 µm. Data are presented as the mean ± SD (n = 3).