Neuraminidase (Exo-α-sialidase) is an exosialidase, is often used in biochemical studies. Neuraminidase cleaves α-ketosidic linkage between the sialic (N-acetylneuraminic) acid and an adjacent sugar residue. Neuraminidase, derived from mucosal pathogens, is a virulence factor that modifies the host’s response to infection.