FIG. 6.

Titers of C. pneumoniae recovered from lungs of immunocompetent (filled circles) and temporarily immunosuppressed (γ-irradiated) (open circles) BALB/c mice. Infectious titers expressed as IFU per lung were assayed by titration of lung homogenates in McCoy cells as described in Materials and Methods. Data (means ± SD for four to five mice) are from one experiment representative of three independent experiments. Asterisks indicate significant differences (P < 0.05) between titers of nonirradiated and irradiated mice.