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Mean CFU of M. pneumoniae (Mp) in BAL cultures of infected mice treated with either cethromycin (25 mg/kg/day subcutaneously) or placebo for 10 days (therapy was started 1 day after infection). Error bars represent standard deviations. *, P < 0.05; ***, P < 0.001. n = 5 to 10 mice per cethromycin treatment group and 5 to 15 mice per placebo group.
