All of the following are immunologic functions of complement except:

The induction of an antiviral state is more closely associated with interferons and other components of the innate immune response rather than with the direct functions of the complement system. Complement primarily enhances the effectiveness of antibodies and phagocytic cells, facilitating processes such as opsonization, where pathogens are marked for destruction, and chemotaxis, which directs immune cells to sites of infection or inflammation. Additionally, complement activation leads to the formation of anaphylatoxins, which are peptides that promote inflammation and attract more immune cells. Thus, while the complement system plays various immune roles, it does not induce an antiviral state directly, which accurately identifies it as the exception among the listed functions.