Split influenza virus vaccines with varying antigen content were adjuvated with polymethylmethacrylate particles, produced by polymerizing monomeric methylmethacrylate in the presence of the subunits, or by addition of the subunits to previously polymerized methacrylate particles. Both adjuvants yielded higher antibody titers than aluminum hydroxide or fluid vaccines. The character of the antigen-adjuvant conjugate of both types of polymer adjuvants is discussed.

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