<i>Pneumocystis jiroveci</i> pneumonia in patients with rheumatoid arthritis treated with infliximab: A retrospective review and case–control study of 21 patients

PCP is a serious complication that may occur early in the course of infliximab therapy in patients with RA. For the proper clinical management of this infectious disease, physicians need to be aware of the possibility of PCP developing during infliximab therapy.