Abstract: In a fluorescence-based
NA inhibition assay, we identified three categories of
NA substitutions associated with reduced inhibition by
NAIs (oseltamivir, zanamivir, and peramivir): (i) novel subtype-specific substitutions in or near the enzyme catalytic site (
R152W,
A246T, and
D293N, N2 numbering), (ii) subtype-independent substitutions (
E119G/V and/or D and
R292K), and (iii) substitutions previously reported in other subtypes (
Q136K,
I222M, and
E276D).