Background: Anemia and transfusion are predictors of disease progression in AIDS patients. This study was designed to examine the effects of blood transfusion on human immunodeficiency virus type 1 (HIV-1) expression.

Study Design and Methods: Assays of plasma viral load were performed before and after transfusion in nine HIV-1-infected patients who required blood transfusion for refractory anemia.

Results: There was a modest rise in plasma HIV-1 p24 antigen and plasma HIV-1 RNA beginning 1 to 2 weeks after the blood transfusion. The mean change in plasma p24 antigen for all patients was 9.3 ± 5.1 (mean ± SE) pg per mL at Week 2 after transfusion and 18 ± 11.1 pg per mL at Week 4. Plasma HIV-1 RNA levels were unchanged immediately after transfusion and exceeded pretransfusion levels with a mean rise of 84 ± 40 percent (SE) at Week 1, 70 ± 27 percent at Week 2, and 67 ± 38 percent at Week 4 (p equals; 0.006, exact permutation test). There was no increase in spontaneous or interleukin 2-induced lymphocyte proliferation or p24 antigen production by patients' lymphocytes that were examined immediately after blood transfusion.

Conclusion: The transfusion of blood to persons with advanced HIV-1 infection modestly increases plasma levels of HIV-1. The activation of HIV-1 expression by transfusion may help to explain the accelerated course of HIV-1 disease in recipients of blood transfusion.