Holloway, B. W. (University of Melbourne, Victoria, Australia) and G. N. Cooper. Lysogenic conversion in Pseudomonas aeruginosa. J. Bacteriol. 84:1321-1324. 1962.-When Pseudomonas aeruginosa strain 1 is lysogenized with phage D3, it loses the ability to adsorb this phage. This loss is attributed to an alteration of the somatic antigens of the bacterium, initially detected by differences in the opsonizing capacity of normal mouse serum for the lysogenic and nonlysogenic strains. Antigenic analysis has suggested that there is a difference in only one antigen between the lysogenic and nonlysogenic organisms.