Pneumocystis jirovecii Pneumonia Complicating Use of Upadacitinib in a Patient With Ulcerative Colitis and Primary Sclerosing Cholangitis: A Case Report

Pneumocystis jirovecii is a ubiquitous, unicellular fungus that can cause pneumonia (PJP) in immunosuppressed individuals. We report the first case of PJP complicating upadacitinib use for ulcerative colitis. This report is of clinical relevance given the widespread uptake of JAK inhibition.