CD8A and viral infectious disease: In order to analyse whether the i.m. route of infection with NY-ESO-1 S-FLU virus would generate a better systemic immune response, NP- or NY-ESO-1-specific CD8+ T cell responses in peripheral blood, lung, and spleen were examined following NY-ESO-1 S-FLU virus infection via intranasal or intramuscular route.