Electronic devices may be provided with displays that have polarizers. An oxide layer is removed from at least one portion of the lead wire, and the at least one portion of the lead wire is chemically gilded immediately after removing the oxide layer. The register is configured to hold a partial sum that is larger than the message segments being added by the adding circuit. A taper is formed on both side portions of the central waveguide so that the width of a core will gradually narrow in the direction of the exit, and the central waveguide is located so that this end portion will not touch the sector slab waveguide. More particularly, vaccine compositions comprising ribavirin and an antigen, preferably an antigen that has an epitope present in Hepatitis C virus, are disclosed for use in treating and preventing disease, preferably HCV infection.