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Survival with late treatment of pneumonic plague: six beta-lactam antibiotics compared to NS. The percentage of surviving mice was recorded every 6 h at the times specified. Treatment was initiated 42 h after aerosol infection of Hsd:ND4 mice with 100 ± 50 LD50s of Y. pestis CO92. Results of three studies were pooled. P was <0.02 (Wilcoxon) for all beta-lactam antibiotics compared to NS.
