<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>An acute bacterial infection that affects the esophagus. Symptoms include severe pain on swallowing and retrosternal pain. Endoscopic examination reveals esophageal mucosal ulcerations and pseudomembranous formations.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>