LED treatment decreases granulocytes in the blood without alter the number of cells in the bone marrow in ALI experimental model. Groups of mice were induced to ALI by ip injection of LPS and treated or not with LED 2 and 6 h after induction. Non-manipulated and LED treated mice were used as control. After 24 hours of ALI induction, the number of cells in the blood and in the bone marrow were quantified. Data mean ± SEM of 6 animals per group. *P < 0.05 in relation to B group; θP < 0.05 in relation to LPS group.