Fig. 3From: Emergence of a virulent porcine reproductive and respiratory syndrome virus (PRRSV) 1 strain in Lower Austria(a + b) Histological lung lesions. a Interstitial pneumonia and catarrhalic to purulent bronchopneumonia with severe atelectasis (bar length 150 μm). b Intralobular interstitial pneumonia including hyperplasia of type II pneumocytes and necrotic cells in the alveolar lumen (bar length 60 μm)Back to article page