activity in C. trachomatis -infected cells. L929 cells were infected with C. trachomatis at a multiplicity of infection of 3 to 5 CFU. At 22 h post infection (hatched bars) or post mock-infection (open bars), cells were isolated and membrane fractions prepared and calcium-stimulated PLA2 activity determined as described in Materials and Methods. Results represent the mean ± standard deviation of three dishes. *p < 0.05.