NeuraminidaseZanamivirInfluenza A virusOrthomyxoviridaePyransOseltamivirSialic AcidsN-Acetylneuraminic AcidArthrobacterInfluenza B virusGuanidinesPronaseHemagglutination TestsSubstrate SpecificityAntiviral AgentsAntigens, ViralCross ReactionsInfluenza, HumanMolecular WeightSerotypingMolecular Sequence Data