TNF and infection: The advantage of using FVLP is that they act against RSV by inducing natural killer cells, activated IFN-γ(+), and IFN-γ(+) tumor necrosis factor (TNF)-α(+) CD8(+) T-cells in the lung and bronchiolar airways during the infection stage but not forming harmful lung plasmacytoid dendritic cells (DCs) and effector T-cells [93].