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Viable cell counts for penicillin-susceptible strain 2132 (A) and penicillin-resistant strains 9605 and 9601 (B) in the lungs and blood of mice at 24, 48, and 72 h after infection. Symbols: ▴, strain 2132; •, strain 9605; ○, strain 9601. Each point represents the mean ± standard error (n = 5 to 7).
