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Numbers of polymorphonuclear neutrophils/mm3 in bronchoalveolar lavage fluid (BALF) 2 hours (H2), 4 hours (H4), and 12 hours (H12) after Pseudomonas aeruginosa CHA and CHA-D1 intratracheal instillations. The data are means + SE (indicated by error bars). *, statistically different from the CHA group (P < 0.05); ○, significantly different from the H2 value for the same strain (CHA-D1) (P < 0.05).
