This paper describes the preparation, chemical characterisation and immunogenic properties of a new polyvalent pseudomonas vaccine.

New cultural methods were devised which allowed a build-up of the immunogen in the cell wall of the bacteria, and mild extraction techniques were used to remove the immunogens from the cell wall of living bacteria without apparent physical or chemical change which might affect immuno-genicity.

The polyvalent vaccine comprised 16 component vaccines, each a lipid-protein-carbohydrate complex extracted from one of the 16 different serotypes of

Single injections into mice of each of the 16 component vaccines induced protection against several strains of homologous serotypes within 3 days of vaccination. The polyvalent vaccine induced similar protection against several strains of each of the 16 serotypes.


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