To confirm the antiviral effects of these peptides, by using the same screening method of CPE assay, several potent peptides were then selected to test a panel of other influenza viral strains including A/Aichi/2/68 (H3N2), A/FM/1/47 (H1N1) mouse adapted strain, and neuraminidase inhibitor-resistant strain of A/Puerto Rico/8/34 with NA-H274Y mutation13. Here, XK is linked to influenza.