In contrast, infection of A549 cells with the mouse-adapted A/Fort Monmouth/1/1947(H1N1) (FM-MA) strain that we previously utilized to study NK cell responses to IAV infection in mice (29) caused significant increases in steady-state mRNA levels of HLA-A, -B, and -C, without causing statistically significant decreases in other NK cell ligands. Here, HLA-A is linked to infection.