FIG. 5.
Intracellular survival of B. henselae in J774. A total of 105 cells were incubated with (closed circles) or without (open circles) IFN-γ (500 U/ml) for 16 h and then infected with approximately 106 B. henselae cells. The number of CFU was determined at different times after gentamicin selection. Each data point represents the mean ± standard deviation (error bars) obtained from triplicate cultures of a representative experiment out of three performed. Asterisks indicate significant decrease of CFU number compared to unstimulated cells (P < 0.05).