Fn was able to survive up to 72 h in dTHP1 cells, although the mean surviving intracellular bacteria were depleted to a small fraction of the inoculums (0.073 living intracellular bacteria per macrophage after 72 h post-infection of 10 originally inoculated bacterial cells per macrophage, Fig. 6a). The gene discussed is FN1; the disease is infection.