FIG. 2.

Pulmonary cytokine levels in nonirradiated and γ-irradiated BALB/c mice during C. pneumoniae infection. Immunocompetent (open bars) and temporarily immunosuppressed (450 rads of γ-irradiation) (filled bars) BALB/c mice were inoculated intranasally with 4 × 10⁴ IFU of C. pneumoniae. On the indicated days p.i., mice were sacrificed and homogenized lung supernatants were collected, as described in Materials and Methods, to determine levels of the indicated cytokines in the lungs. Data are presented as means ± SD for five to six mice in one representative experiment out of three.