Lung infiltrates (in quadrants) peaked at day 3 (3.1 ± 1.0 vs. 2.9 ± 1 at Day 0, P < 0.01) and then decreased during the study in the entire group, especially at Day 10 (2.8 ± 1.1, P < 0.83 vs. Day 0), which reflected the improvement in survivors (3.1 ± 1.0 at Day 3 vs. 2.9 ± 1.0 at Day 10, P < 0.01).