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Cumulative survival of rabbits with penicillin-resistant (strain 16089) and penicillin-susceptible (strain 195) S. pneumoniae experimental pneumonia, according to inoculum concentration (10 log10 versus 7 or 8.5 log10 CFU/ml, P < 0.05, log-rank test). Symbols: -----, strain 16089 (inoculum, 10 log10); ——, strain 195 (inoculum, 10 log10); –-–-, strain 16089 (inoculums, 7 and 8.5 log10).
