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Passive Immunization Against Experimental Pseudomonas Infection: Correlation of Protection to Verder and Evans "O" Serotypes

^a The Shriners' Burns Institute, and the Department of Microbiology, The University of Texas Medical Branch, Galveston, Texas 77550

ABSTRACT

Passive-protection tests were conducted in mice with antisera from rabbits immunized with formalinized or heat-killed cells or with an alcohol-precipitated fraction from the slime layer. Protection was conferred by antisera against the heatstable antigens and correlated well with agglutinin levels. Specificity was found to relate closely to the heat-stable "O" serotypes as defined by Verder and Evans.

¹ Present address: Department of Biological Sciences, North Texas State University, Denton, Tex. 76203.