Figure 1From: Interstitial lung disease associated with Equine Infectious Anemia Virus infection in horsesGrading of the histological lesions from lung sections. A. Absence of histological lesion in the lung parenchyma of an EIAVNEG horse (#91-rom). B. Mild lesions of broncho-interstitial pneumonia in an EIAVPOS horse (#1-rom) revealed peribronchiolar and interstitial lymphocytic accumulation with mild thickening of the interlobular septa. C. Moderate lesions in EIAVPOS horse (#78-fr) with accumulation of lymphocytes within the septa and moderate thickening of the alveolar walls. D. Severe lesions of interstitial pneumonia in EIAVPOS horse (# 2-rom) with peribronchiolar lymphocyte infiltration, partial destruction of bronchiolar epithelium, peribronchiolar accumulation of smooth muscle cells and thickening and partial destruction of the alveolar septal leukocyte exudate. (►) Interstitial lymphocyte accumulation; (✶) thickening of the interlobular septa; (➔) destruction of alveolar walls; () peribronchiolar accumulation of smooth muscle cells; a: alveoli; b: bronchiole.Back to article page