Figure 3.

Cytokine secretions in lung tissue of BALB/c mice versus C57BL/6 mice after infection with Chlamydia muridarum. Groups of eight mice for each strain were inoculated intranasally with 8000 inclusion-forming units (IFU; for days 2 and 4 infection) or 2000 IFU (for day 12 infection) of C. muridarum. At days 2, 4 and 12 post-infection, lung homogenates were prepared for lung IFU titrations and for assays of cytokine levels by enzyme-linked immunosorbent assay. The data represent the mean ± SD from eight individual mice. One of three independent trials with similar results is shown. *P < 0·05.