Also, acute T cell-mediated rejection (requiring prolonged and stronger immunosuppression beyond steroids) and treatment with rituximab significantly increase the risk of PJP.35, 36, 37One retrospective study analyzed the correlation of serum biomarkers in the clinical course of PJP, and found that serum surfactant protein-D values increase when there is failure in non-HIV PJP, but no such correlation was found with β-D glucan, Krebs von den Lungen-6 antigen levels.38 Here, SFTPD is linked to pneumocystosis.