Figure 6. Addition of iron enhances in vitro mycobacterial growth.

BCG Pasteur growth was measured at increasing concentrations of ferric ammonium citrate (FAC) added (a) directly to Bactec MGIT tubes and (b) to 96 hour cultures of THP-1 cells. Points represent the mean of duplicates and bars the SEM. Δ log₁₀ CFU = (log₁₀ CFU of sample − log₁₀ CFU of control).