IFNG and tuberculosis: Both HIV-negative and HIV-positive subjects with active tuberculosis responded to PWM and PHA even if the IFN-γ titers in response to PHA were lower in HIV-positive than in HIV-negative tuberculosis patients (1940 ± 1689 pg/mL versus 4161 ± 2123 pg/mL in response to PHA; 3550 ± 1906 pg/mL versus 2625 ± 480 pg/mL in response to PWM).