In that report, the exposure of mice to TiO2 nanoparticles enhanced the levels of interferon (IFN)-γ and chemokine RANTES, representative markers of pneumonia, in the bronchoalveolar lavage fluids (BALF) of RSV-infected mice and histopathologically exacerbated pneumonia in RSV-infected mice [7]. This evidence concerns the gene CCL5 and susceptibility to pneumonia measurement.