FIG. 1.

Kinetics of B. henselae entry in J774 cells. Bartonellae were allowed to invade cells for the indicated times. Gentamicin (250 μg/ml) was added to kill extracellular bacteria, cells were lysed, and the number of internalized bartonellae was determined by serial dilution and agar plating. All results are expressed as CFU recovered per microtiter well (mean ± standard deviation [error bars] obtained from triplicate cultures of a representative experiment out of three performed).