It has been previously reported that in animal models of sepsis36, 37, 38 and pneumonia,13, 14, 19 MSCs have been shown to repolarize macrophages from M1 to M2 phenotype, which is characterized by high IL‐10, low TNF‐α expression, and increased capacity of phagocytosis. This evidence concerns the gene IL10 and susceptibility to pneumonia measurement.