[Enzyme activity of the neuraminidase from various strains of the influenza A virus].

Some chemical properties of neuraminidase of the mouse-pathogenic strain A/PR/8/34 (H0N1) and the mouse-apathogenic strain A/Krasnodar/101/59 (H2N2) were studied. Neuraminidase of the pathogenic strain was shown to have a lower specific activity, lower resistance and lower sensitivity to the inhibiting effect of CI ions than neuraminidase of the nonpathogenic strain.