(a)Recommended in HIV-infected children aged between 1 and 13 years without severe immunosuppression(b)Recommended in HIV-infected individuals aged over 14, non-immune to measles, and with a CD4 count ≥ 200/mm3(c)Not recommended in children with CD4 T-cell percentage < 15 or patients aged > 14 with CD4 count < 200 cell/mm3(d)Quadrivalent MMR-varicella not recommended. The gene discussed is CD4; the disease is chickenpox.