XK and infection: Similarly, the results presented by Wu et al. [32] were proved to be that anti-IFV strain A/Leningrad/134/17/1957 (H2N2) of PA with IC50 of 4.03 μM and suggested that the support of PA used in H2N2-elicited infection was related to interference of PA with in silico NA activities through stabilization by binding NA invariant key active-site residues Asp151, Arg152, Glu119, Glu276, and Tyr406.