CD4 and HIV infectious disease: We conducted a survey among patients diagnosed with HIV infection and reviewed their medical records to collect the following information; age, sex, presence of pain or numbness, duration of pain or numbness, duration of HIV infection, clusters of differentiation 4 (CD4) T-cell count, ribonucleic acid (RNA) load, diagnosis and duration of acquired immune deficiency syndrome (AIDS), treatment status and duration of highly active antiretroviral therapy (HAART).