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The ratio of stearic to oleic acids, i. e. the fatty acid saturation index, in red blood cell membranes was assayed in 60 patients with chronic hepatitis C virus infection before and after interferon-alpha therapy. Results were compared with 20 healthy controls. Hepatitis C virus titre was also assayed before and after interferon-alpha therapy. Within 2-5 months following interferon-alpha therapy, a significant inverse correlation was observed between saturation index and hepatitis C virus load. We conclude that hepatitis C virus infection enhances the degree of desaturation of 18-carbon fatty acids and that interferon-alpha is involved in their metabolism by increasing the degree of saturation and subsequent decrease in membrane fluidity.