CD4 and infectious disease: However, the results on the lymphocyte subsets were finalized during the patient’s visit to the infectious disease outpatient department at Anhui Provincial Hospital following discharge, with the report indicating CD3 levels of 540 cells/μL, CD4 levels of 19 cells/μL, CD8 levels of 497 cells/μL, and a CD4/CD8 ratio of 0.04.