The Poxvirus Antigens.- Advances in Rickettsial Research.- Die molekularen Grundlagen der Photoreaktivierung. Mit 7 Abbildungen.- Rubella Virus.- Endotoxins and the Immune Response.- Serum Inhibitors of Myxoviruses.- Cellular Membrane Alterations in Neoplasia: A Review and a Unifying Hypothesis.- Author Index.