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We report the evolution of chronic infection with human immunodeficiency virus type 1 (HIV-1) in a patient treated with stavudine plus didanosine, whose CD4+ lymphocyte count progressively decreased, despite a sustained plasma viral load &lt;20 copies/mL. After 12 months of therapy, treatment was switched to zidovudine plus lamivudine plus nelfinavir. CD4+ T cell count decreased from 559 x 10(6)/L at month 0 to 259 x 10(6)/L at month 12. Plasma viral load decreased from 21,665 HIV-1 RNA copies/mL at baseline (month 0) to &lt;20 copies/mL after 1 month of therapy with stavudine plus didanosine, and remained below 20 copies/mL until month 12, but always &gt;5 copies/mL. Viral load in tonsilar tissue at month 12 was 125,000 copies/mg of tissue. After the change to triple-drug therapy, the plasma viral load decreased to 5 copies/mL, the CD4+ T cell count increased to 705 x 10(6)/L, and the viral load in tonsilar tissue decreased to &lt;40 copies/mg of tissue at month 24. A low level of HIV-1 replication could explain the lack of immunologic response in patients with apparent virological response.

clinical infectious diseases/clinical infectious diseases (online. university of chicago. press)

Residual Low-Level Viral Replication Could Explain Discrepancies between Viral Load and CD4+ Cell Response in Human Immunodeficiency Virus—Infected Patients Receiving Antiretroviral Therapy