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Wet/dry lung weight ratio for immunocompetent and leukopenic mice infected with S. pneumoniae (means + SD [error bars] for five mice). Values that were significantly greater than those observed for infected immunocompetent mice are indicated by symbols as follows: ∗, P < 0.01; §, P < 0.001. Values for uninfected immunocompetent versus leukopenic mice were, respectively, 4.4 ± 0.2 and 4.2 ± 0.2.
