Physical activity; alcohol; smoking; psychological health; adherence to antiretroviral therapy; monitoring CD4 T-cell count and viral load (HIV) testing; hepatitis A (HAV) and B (HBV) vaccination status; HBV and hepatitis C (HCV) investigation status; fasting blood cholesterol, fasting blood sugar, blood pressure, and BMI; cervical cytology in women; sexually transmissible infection (STI) screening in men who have sex with men. This evidence concerns the gene CD4 and sexually transmitted disease.