In HIV-infected patients, no significant statistical difference was observed between PJP group and non-PJP group in the following laboratory test results, including white blood cell count, lymphocyte count, neutrophil count, platelet count, hemoglobin, albumin, globulin, creatinine, alanine aminotransferase, aspartate aminotransferase, C-reactive protein, erythrocyte sedimentation rate (ESR), procalcitonin and interleukin-6 (all P > 0.05). This evidence concerns the gene IL6 and pneumocystosis.