*Caused by a [[Circoviridae|porcine circovirus]] alone or in combination with [[Parvoviridae|porcine parvovirus]]
*Caused by a [[Circoviridae|porcine circovirus]] alone or in combination with [[Parvoviridae|porcine parvovirus]]
−
*May cause mild [[Lungs Inflammatory - Pathology#Interstitial pneumonia|interstitial pneumonia]], failure of lungs to collpse on opening the thoracic cavity
+
*May cause mild [[Interstitial Pneumonia|interstitial pneumonia]], failure of lungs to collpse on opening the thoracic cavity
*Microscopically: thickening of alveolar wall due to type 2 pneumocyte hyperplasia
*Microscopically: thickening of alveolar wall due to type 2 pneumocyte hyperplasia