A 4-year-old girl is brought to your clinic for evaluation. She was diagnosed with HIV at 7 months of age based on two positive HIV nucleic acid tests (HIV DNA PCR and HIV RNA). She had taken antiretroviral therapy from birth until about 6 months of age when, at that time, the parents discontinued the antiretroviral medications because they were worried about medication safety. Although she has remained asymptomatic, her CD4 count has declined and is now 550 cells/mm³ with a CD4 percentage of 22%. Her HIV RNA level is 93,100 copies/mL.