Survival after pulmonary infection via the intranasal route with 1 × 10³ CFU of K pneumoniae B5055. Numbers in parentheses denote surviving animals/total number of animals. *, P = .0094 of treatment with G-CSF/pre compared with mice treated with MoAb III/5-1 (both groups) and P = .011 of treatment with G-CSF/pre compared with control animals and animals receiving G-CSF after induction of pneumonia (Cox-Mantel test).