Effect of different treatments on the growth and spread of 1 × 10³ CFU of K pneumoniae B5055 instilled into the lungs. Treatments are as outlined in Table 1. The number of animals investigated is given within the bars. Data are given as median ± quartiles. *, P = .017 compared with control animals; **,P = .0074 compared with control animals and .0019 compared with treatment with G-CSF/pre; ***, P = .014 compared with treatment with G-CSF/pre (Mann-Whitney U test).