Lower levels of IFN-γ mRNA measured during RSV infection could favor the development of asthma: Renzi et al. [27] found that in children hospitalized with acute RSV infection, those who developed asthma had significantly lower levels of IFN-γ produced by their PBMCs at the time of acute RSV infection than those who did not have asthma [57]. This evidence concerns the gene IFNG and asthma.