CD4 and infection: When lung cells were stimulated with iB/Florida (Fig. 7K through N) or NA of B/Florida (Fig. 7O through R), the NA mRNA + sFL group showed moderately higher levels of IFN-γ+ CD8 T and IFN-γ+ CD4 T cells than those from the sFL, NA mRNA 1 μg, and naïve infection control groups (Fig. 7O through R).