Histological characterization of wild boar lungs classified as early type, late type and without macroscopic EP-like lesions.

A total of 106 wild boar lungs were examined. Numbers in brackets indicate the percentage of lungs affected in each category. Only features with significant association with positive PCR results in bronchial swabs are indicated. Significant differences among the three categories of macroscopic lesions were: 1) more frequent BALT hyperplasia and lymphoid follicle formation in lungs with macroscopic lesions than without (both types pooled; p-value = 0.0023); 2) higher number of lymphoid follicles in lungs with late type macroscopic lesions than without (p-value = 0.0056); 3) more frequent neutrophilic infiltration in the airways in lungs with late type lesions than in those with early type or no lesions (p-value ≤ 0.0089); 4) more frequent intraalveolar edema in lungs with late than early type lesions (p-value = 0.0448).Histological characterization of wild boar lungs classified as early type, late type and without macroscopic EP-like lesions.