A 12-week-old baby girl who was recently diagnosed with HIV is brought to the clinic for initial evaluation. The infant had a positive HIV DNA at week 8 and a positive follow-up HIV RNA test at week 9. She has been feeding well and gaining weight appropriately, and her mother reports no concerns. The infant’s CD4 count is 1,320 cells/mm³ and the CD4 percentage is 29%; she is started on combination antiretroviral therapy.