[Effect of various forms of human leukocyte interferon on the natural killer activity of human lymphocytes].

The effect of the preparations of human leucocytic interferon (HLI) of various purity levels and of various concentrations was studied with respect to the natural killer activity of human leucocytes. It was shown that the process of purification and concentration of the preparation of HLI with the Kantel method entailed a disproportionally high loss of the activity stimulating the natural killer cells as compared to the antiviral activity.