Cytokine levels in cell culture supernatants of PBMCs ± <i>Mtb</i> H37Ra infection on days 0, 3, 5 and 8.

Cytokine concentrations in cell culture supernatants were determined by ELISA for PBMCs infected with Mtb H37Ra, (open bars) uninfected PBMCs (hash bars). Data were plotted as mean ± SD and represent 10 samples per group. Experiments were performed in triplicate per condition per donor. **p<0.01 infected compared to uninfected cells.