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N. Goto, S. Oka. Pneumocystis jirovecii pneumonia in kidney transplantation. Transpl Infect Dis 2011. All rights reservedPneumocystis jirovecii pneumonia (PCP) remains an important cause of morbidity and mortality in immunocompromised renal transplant recipients. In recent years, PCP outbreaks in renal transplant centers have been reported in many countries. Person–to–person transmission between PCP patients and other recipients lacking prophylaxis is one of the possible sources of infection. To prevent infection, effective prophylaxis in susceptible patients is recommended. Trimethoprim–sulfamethoxazole (TMP–SMX) is the most effective drug for PCP prophylaxis, but its recommended duration of use after transplantation varies among the different guidelines. The European Renal Association recommends a prophylaxis period of 4 months after transplantation, the American Society of Transplantation (AST) 6–12 months, and the Kidney Disease Improving Global Outcomes guidelines 3–6 months. Lifelong prophylaxis with TMP–SMX is not recommended in renal transplant recipients; however, in many cases, PCP has occurred after the recommended prophylaxis periods after transplantation. In this minireview, we discuss the risk factors including environmental–nosocomial exposure; state–of–the–art diagnosis, treatment, prophylaxis and isolation; and references to the AST 2009 guidelines with the aim of integrating our experience with PCP outbreaks into recent reports, and we discuss how renal transplant recipients can be protected from PCP.