FOXP3 and respiratory syncytial virus bronchiolitis: As Foxp3+ regulatory T cells (Tregs) play an important role in maintaining the homeostasis of the immune system,10, 11 as well as limiting the inflammatory response in the lungs during the acute phase of RSV bronchiolitis, 12, 13, 14 we hypothesized that the frequency of circulating Tregs might differ in those children subsequently developing recurrent wheezing.