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Growth/clearance of different titers of A. baumannii strain 307-0294 in the rat pneumonia model. Rats were challenged with 7.0 × 106, 5.8 × 107, 3.5 × 108, 4.3 × 108, and 7.7 × 109 CFU of 307-0294 (blood isolate, ST15, clonal group 1) by intratracheal instillation, and total lung bacterial titers were determined at 0, 3, 6, 24, 48, 72, and 168 h. Data are means ± standard errors of the means for n = 3 for each challenge titer and time point.
