Fig. 3From: A post-mortem study of respiratory disease in small mustelids in south-west EnglandPleuritis in polecats. a This animal shows advanced pyothorax and haemopericardium. Numerous Gram positive cocci and a small number of Gram negative bacilli were present in the purulent fluid but the source of infection was not established. b Pleuritis caused by a grass awn (arrow)Back to article page