Infectious Disease: Lung: Pneumonic plague
An autopsy specimen, consisting of a section of lung showing an extensive area of pneumonic consolidation. Histology shows almost confluent pneumonic consolidation with fibrino-haemorrhage and in many areas purulent exudates in the alveolar spaces. Oedemafluid and leucocytes are present in the bronchial lumina. Small Gram negative bacilli are just discernible in a Gram stained section.