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High-molecular-weight polysaccharide from Pseudomonas aeruginosa immunotypes 1 and 2 gave cross-protection in outbred CD-1 mice challenged with the heterologous immunotype organism. Both active immunization with 50 micrograms of polysaccharide, as well as passive transfer of immune serum were effective. The basis for this cross-protection is the ability of high doses of polysaccharide to induce antibody formation to both homologous and heterologous immunotype determinants.
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Gerald B. Pier (1982) studied this question.
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