pneumonia A lung disease that involves lung parenchyma or alveolar inflammation and abnormal alveolar filling with fluid (consolidation and exudation). It results from a variety of causes including infection with bacteria, viruses, fungi or parasites, and chemical or physical injury to the lungs. It is accompanied by fever, chills, cough, and difficulty in breathing. DOID:10509 DOID:11742 DOID:552 DOID:5871 MESH:D011014 NCI:C3333 SNOMEDCT_US_2016_03_01:155548002 SNOMEDCT_US_2016_03_01:155552002 SNOMEDCT_US_2016_03_01:155558003 SNOMEDCT_US_2016_03_01:233604007 SNOMEDCT_US_2016_03_01:266391003 SNOMEDCT_US_2016_03_01:274103002 SNOMEDCT_US_2016_03_01:60363000 UMLS_CUI:C0032285 acute pneumonia disease_ontology lung disease