Messiaen Messiaen PE PE Cuyx Cuyx S S Dejagere Dejagere T T The role of CD4 cell count as discriminatory measure to guide chemoprophylaxis against Pneumocystis jirovecii pneumonia in human immunodeficiency virus-negative immunocompromised patients: A systematic review The role of CD4 cell count as discriminatory measure to guide chemoprophylaxis against Pneumocystis jirovecii pneumonia in human immunodeficiency virus-negative immunocompromised patients: A systematic review Transpl Infect Dis Transpl Infect Dis 2017 2017 19 19 2 2 10.1111/tid.12651 10.1111/tid.12651. This evidence concerns the gene CD4 and pneumocystosis.