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The production of interferon-gamma and tumour necrosis factor-alpha was evaluated in the peripheral blood mononuclear cells (PBMCs) from healthy donors and AIDS patients after Rhodococcus equi infection in vitro. PBMCs from healthy donors secreted elevated levels of IFN-gamma and TNF-alpha when challenged in vitro with killed R. equi, whereas the release of both cytokines was impaired in supernatant cultures from AIDS patients. We conclude that the failure of IFN-gamma generation in AIDS patients in response to R. equi is not antigen-specific but it may reflect the global impairment of T-cell function. In such patients, however, the infection with R. equi, a facultative intracellular pathogen which survives and replicates within macrophages, may be responsible for the impairment in the TNF-alpha release, possibly enhancing the HIV-induced macrophage dysftmction.

Defective production of interferon-γ and tumour necrosis factor-α by AIDS mononuclear cells after in vitro exposure to Rhodococcus equi