CD8A and infection: In a model of H1N1 IAV-induced ALI, we showed that intravenous administration of MSCs induced a shift of monocyte phenotype in whole blood and enhanced the recruitment of granulocytic myeloid-derived cells, B cells (ASB), and T cells (CD8+) from circulation to the site of infection while reducing immune cell infiltration into bronchoalveolar space caused by H1N1 IAV infection.