Clinical details that were collected from 50 patients with diabetes and CAP included their age, gender, body temperature, white blood cell count, absolute neutrophil count, serum C-reactive protein (CRP), procalcitonin (PCT), erythrocyte sedimentation rate (ESR), interleukin-6 (IL-6), CD4+, CD8+, CD3+, NK cells, imaging changes, duration of hospitalization, number of improved cases, and number of deaths. This evidence concerns the gene CD8A and diabetes mellitus.